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Cybex Eternis S SensorSafe All-in-One Convertible Car Seat - Lavastone

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The new CYBEX Eternis S with SensorSafe is the only seat your child will need from birth and beyond. With three modes -- rear-facing, forward-facing and booster, this All-In-One Convertible Car Seat is designed for use from birth up to 120 lbs. The Eternis S with SensorSafe integrates important safety technology into the chest clip of the car seat to alert when unsafe situations arise. The alerts are provided through a vehicle receiver and the caregiver’s smartphone. The Eternis S with SensorSafe alerts when the driver accidentally leaves the child behind secured in the car seat, a child unbuckles their chest clip while the vehicle is in motion, the back seat has become too warm or too cold and when a child has been seated for too long —all through a user-friendly app, that also provides guidance on installation, how-to videos, FAQ’s and more. Additionally, the Eternis S with SensorSafe offers an adjustable Linear Side-impact Protection (L.S.P. System), which absorbs up to 25% more impact forces in the event of a near side impact collision* and a patented 3-position reclining headrest, which helps prevent the child's head from falling forward while asleep, guiding the head and neck into a safe position. These features, combined with a steel reinforced frame for strength and durability provide advanced child safety protection and peace of mind.
  • Rear-facing from 4 lbs. to 50 lbs. Forward-facing from 22 lbs. to 65 lbs., Belt-positioning Booster from 40 lbs. to 120 lbs.
  • 5-point safety harness with SensorSafe Technology integrated in the chest clip (not used in Belt-positioning Booster mode)
  • Adjustable Linear Side-impact Protection (L.S.P. System) absorbs up to 25% more impact forces in the event of a near side impact collision* (*when compared to the same car seat without L.S.P. extended)
  • Patented 3-position reclining headrest helps prevent the child's head from falling forward while asleep, keeping the head and neck in a safe position and ensures a comfortable sleeping position
  • In-seat recline provides correct ergonomic positioning and extra legroom, allowing your child to safely ride rear-facing longer
  • 12-position, height-adjustable headrest with an integrated no-rethread harness for protection that grows with your child
  • 6-position one-hand adjustable recline for the best fit to your car
  • Magnetic buckle holders for easy entry and exit from the seat
  • Removable newborn inlay provides additional support for very small babies (4 lbs. to 11 lbs.)
  • Removable cup holder can be positioned on either side and is dishwasher safe for easy clean up
  • Cozy harness pads and 2-position padded buckle for comfort
  • Steel reinforced frame provides strength and durability
  • Energy absorbing shell and base help reduce the forces felt by the child in a collision
  • Dual Belt adjusters to ensure a tight fit
  • Dual-level indicators to help ensure the proper angle
  • Innovative one-pull LATCH removal system
  • LATCH Connection storage provided under the seat when not in use
  • Ergonomic design in CYBEX’s iconic Gold Design language
  • Designed and engineered in Germany

How SensorSafe Works:

Originally developed to help prevent the rising number of infant hot car deaths, SensorSafe will chime through the installed vehicle receiver to alert when a child is still secured in the back seat after the car has been switched off. This reminds the caregiver to act quickly, but if the child is still secured after several minutes an alert will be sent to the caregiver’s cellphone through the downloaded app. If the situation is still not remedied, the designated emergency contact will receive an alert with the GPS coordinates of the vehicle’s last known position. This state-of-the-art safety technology is designed so there is no need to reinstall each time you drive. For ease, just keep the receiver plugged into your car’s OBD port to drive with that extra peace of mind.
  • Chimes through the installed vehicle receiver if child is still secured in the seat when the car is switched off
  • Alerts through the caregiver’s cell phone if the child is left behind in the vehicle secured in the car seat and then alerts the designated emergency contact if the situation is still not remedied
  • Emergency contact receives GPS coordinates of the vehicle’s last known position
  • Alerts through the vehicle receiver and caregiver’s smart phone when the child has unbuckled their chest clip while the vehicle is in motion
  • Monitors the back seat temperature to alert through the vehicle receiver and the caregiver’s smart phone when the back seat appears to be too hot or too cold for the child’s comfort
  • Provides warnings to the caregiver when the child may have been seated for too long and needs a break
  • Receiver plugs directly into your car’s OBD port and syncs with the caregiver’s cell phone
  • Only one install needed if receiver is kept plugged into vehicle’s OBD port
  • Helps ensure proper use by providing guidance on installation, how-to videos, FAQ’s, direct link to customer service and more through the SensorSafe app
  • App can monitor up to 16 chest clips on a single platform
  • App download available for Android and IOS


  • Measurements: Forward-facing (Fully upright) H 25.5” x W 20” x D 25.3”
  • Weight: 26 lbs.
  • Use from Birth up to 120 lbs. or 57 inches, following the directions in your user manual

Review Summary
35 Reviews
77% (27)
23% (8)
0% (0)
0% (0)
0% (0)
97% Recommend this product (34 of 35 responses)
By Andora
Larchmont, New York
Great brand
July 31, 2020
I love Cybex for their quality and high standards in their products. Car seat what grows with your child. Definitely a big plus. My child is comfortable in it. Only thing I wish we could try it out first. Is kind large and little bit to big to fit 3 car seat in one row.
  • Comfortable
  • Very large
By Sydney s.
Midland tx
December 29, 2019
Very well made. My 2 year old daughter loves her new seat.
  • Easy install
  • Heavy
By Carlos S.
Great seat, not so easy to install
October 11, 2019
The car seat is beautiful, is comfortable but is not easy to install. The straps are difficult to adjust, tightening the latch system is hard. The sensor safe only works in United States, if you go in a journey to another country the system is not going to work.
  • The car seat is beautiful, is comfortable
  • The straps are difficult to adjust, tightening the latch system is hard. The sensor safe only works in United States, if you go in a journey to another country the system is not going to work.
By Kristel
Waukegan, Illinois
A must have!
July 25, 2019
The technology of this car seat is amazing!
It’s definitely a game changer.

I would definitely recommend to my friends and family

I first received my car seat and there was some kind of burn mark ok the exterior of the car seat. After reaching out to customer service I got a replacement. Amazing customer service!
Best UsesEvery day
Vienna, VA
Love the brand
June 20, 2019
We had a Cybex infant car seat and it worked out great for us. I was thrilled to hear they also make convertible car seats. We ordered the Eternis S and it has worked very well. It’s very comfortable, fits our car perfectly, and love the head recline option! Not a lot of car seats offer this. My son’s head doesn’t move forward anymore, such a relief for his neck!
By Natalia
orlando, FL
A car seat from nb to 10 years
June 8, 2019
Love the color and quality, since I'll be able to use til my son is 10 years with the high capacity of it.
By Nora
New Orleans, Louisiana
Everything looks good.
May 24, 2019
This is my second carseat and everything looks very good and secure.
By Lilian
Miami, Florida
Security and Design
May 10, 2019
Excellent car seat, amazing design and security system!
By Jessica
Love this car seat!
May 8, 2019
My 9 month old seems to be super comfortable in this seat. Love the sensor safe feature. I like that this is a all in one carseat that will grow with my baby.
Boston, MA
Loving everything about it
March 31, 2019
I'll admit I was nervous about transitioning our not-quite-one-year-old to a convertible car seat and about learning to install a new one, just when we'd gotten good at the infant seat. But this one was super-easy to install (we used the LATCH connections, not seatbelt), and the baby seems to be very comfortable. A few days after we installed it, we had a 6-hour round-trip weekend car ride, and it looked like he enjoyed having the extra space this seat provides. The adults in our family are appreciating the sophisticated, subtle design aesthetic, in shades of gray, and the ease of adjustment. The mechanism to tighten and loosen the belts to get baby in and out works easily and smoothly, and the system to adjust the height of the headrest couldn't be simpler. It's connected to the top of the shoulder part of the straps, which makes it super fast to adjust them higher as he grows. On the road-trip weekend, we had our two-year-old, much larger nephew in the seat at one point, and we could set it up for him and then back to fit our son in a flash. (Just to note: this seat is substantial, best to install and then leave in the car. It's not the kind you'll want to put in and out, switching between cars.) The second weekend using it, on another roadtrip, we set up the SensorSafe function, too, connecting it to the car's computer and downloading the SensorSafe app so we could connect the seat to a smartphone. That was all pretty seamless, the hardest part being to find the jack for the piece that connects to the car's computer. From there, the seat connected to the car and then to a phone easily. Now, there's a chiming sound when the car turns off if the seat is buckled, reminding us that baby is still buckled in, and, once he's old enough to figure out how to unbuckle himself, it'll warn us about that too, which will be great. The app also shares the temperature in the area immediately around the seat. We're very much looking forward to using this for years to come, from the rear-facing seat we currently have it installed as, to front-facing and then converting it to work as a booster.
* This product review was collected by the manufacturer.
San Francisco
So far so good
March 17, 2019
We’re a fan of Cybex baby gears and when this all-in-one car seat came out it was a must for us. We got two for both of our kids to ride in our SUV and they are so happy with it. They seemed comfortable enough to nap happily for long car rides. Well made, safe and well designed.
  • I wish the magnets on the side to hold the seatbelt up are stronger.
By Benjamin
New York, NY
Sets a new standard for quality and features
February 9, 2019
Has so many features which will make your child safer and your life easier.
The magnetic belt clips and SensorSafe app were the features that gave this seat the advantage over comparable products.
The build quality and materials put into this seat struck me straight as I pulled it out of the box.
Overall I am very satisfied and give an extremely positive recommendation.
* This product review was collected by the manufacturer.
By JPier
New Jersey
Luxury Carseat
January 31, 2019
I want my child to have the best of everything and this car seat is certainly the best one on the market for several reasons. First, the material is soft yet sturdy and most importantly the design itself makes it easier for bigger babies, like mine, to be comfortable during long rides. There is padding with infant inserts too which makes it amazing to use from the time the baby is born up until they are ready to be out of a car seat! And...BEST OF ALL, I CAN WASH THE FABRIC that comes off!!! In addition, it was easy to install and is easy to adjust. What I love is that the headrest tilts which helps the baby stay in the correct position while sleeping. Also, I love that eventually when the baby is big enough to be front facing, the seat belt will go through the red clip. Moreover, SensorSafe is really cool with the manuals on the app & temperature and unbuckling notifications right on your phone. It's a great parent back-up and low-jack since it tells you where the car seat is! I'm really impressed with the magnetic buckles to get the baby in and out of the car seat easily.....THIS CAR SEAT HAS IT ALL!
* This product review was collected by the manufacturer.
By Kayleesmom16
Bronx, NY
Beautifully made
January 31, 2019
This carseat is amazing! My toddler loves it and she has always hating getting into the carseat. The headrest is very comfortable for her and she sleeps well in it. I was even able to keep her rear facing longer because of the positioning and extra leg room. Overall it is a wonderfully made car seat with lots of amazing features.
* This product review was collected by the manufacturer.
By Mika
New York
Strong Car Seat for Toddlers
January 25, 2019
First of all, i have to say that i was looking through so many car seats and read so many reviews for my little one. When it came to car seats one of the most recommended brands through family and friends was Cybex company. To be honest i never heard of the company until recently.
I was very hesitant to order Cybex Gold - Eternis S with sensor safe car seat.
The car seat is great. It is not too bulky and it has a great color. The material on the car seat is washable, which i love.
The installation itself was fairly easy. You just have to read the manual and you have to make sure that the back of the car seat stripes are locked properly.
What i love about this car seat is that it has two red handles where the child head is and it allows you to adjust the cushion for the head base on the child's height. It also accommodates your child as their grow and you can change their sitting position.
The safety belt is easily adjustable and and i love the sensor safe option that has built in to the chest clip. If it happens that your child tries to untie themselves or there are some unsafe movements in the car seat the system will alert you via app that you install on the phone.
I also loved that on the left side of the car seat there is something called Linear Side Impact protection. If you are happen to be in the car accident this button that is on the side will activate to provide extra safety for your child.
The car seat is very safe and sturdy , but it is also child friendly in terms that you can wash the fabric and remove the cup holder and wash it in the washing machine.
I would definitely recommend all parents when it comes to child safety not to look at the price of the car seat.
Look at it's overall safety .
I will keep using all Cybex products for my little growing family.
After all, what matters to me is the quality of the product which will keep my family safe.
* This product review was collected by the manufacturer.
By Kappa1
Boston MA
Great Protection
January 25, 2019
The carseat is perfect for baby travel. Easy to install and works perfectly as described. The 3-position reclining headrest helps put the baby in a comfortable position. Also, it doesn't take much space, so the person sitting in the front passenger's seat can have enough leg room. The pads are very cozy which make the baby comfortanle. The SensorSafe feature alerts you when the ignition of the car is off so you dont accidentally leave forget the baby in the car.
The only downside to this carseat is that the base is not detachable which makes it difficult moving the baby when sleeping without waking them up.
* This product review was collected by the manufacturer.
By KC123
St. Cloud, MN, United States
January 23, 2019
Very sleek and stylish looking. Both of my kids fight over who gets to sit in it as they find it very comfortable. Only 4 stars for me because installation was a little difficult and the sensor chest clip is very stiff and hard to release. Hoping it gets better the more we use it.
* This product review was collected by the manufacturer.
By BNMama88
Lancaster, PA
Great Quality Car Seat
January 21, 2019
My first impression upon taking this car seat out of the box was that it is made very well, and feels high quality. It is heavy-duty (heavy!) and very comparable to our older car seat of a different brand. The seat is nicely padded and seems very comfortable for my two-year-old who fits in it well. You can tell a lot of thought was put into the design as it has newer features that we didn't have with our old car seat such as the "linear side-impact protection" and detachable cup holder. We were also impressed that it has a "sensor safe" chest clip to alert you that a child is still in the vehicle. It pivots easily on its base for adjusting the angle of recline. I did find the installation of this car seat to be confusing right off the bat because we so enjoy the "click tight" method of car seat installation and this doesn't have that. From reading the user manual and after practice, the installation has gotten much easier. I definitely feel comfortable with the safety of my children in this seat. We've been impressed overall with this car seat, and other than lacking "click-tight" it's perfectly equipped with everything you need.
* This product review was collected by the manufacturer.
By jwycoff
Ellington, CT
Baby rides in style with this carseat!
January 20, 2019
We looked long and hard for transition car seats after our little one started outgrowing her old one.

The Cybex Gold is truly the perfect transition car seat. It is comfortable with 6 different reclining angles, depending on forward or rear-facing mode. The shoulder straps tighten with ease, something that wasn't the case with her previous car seat. There is no opportunity for pinching the little one's inner thigh with a super helpful cover to the buckle. And, to uphold my knack for being a techie, the SensorSafe technology was easy to install in the car and on my smartphone.

The car seat has special "pop-out" on the side, meant to minimize forces on side-impact crashes. I especially appreciated the attention to detail *AND* safety in this car seat.

If I were being nit-picky, the installation was a little daunting AT FIRST. The installation guide is thick, but it includes installations for newborn, rear-facing, and forward facing in like three languages. Once you find the section that is applicable to your little one, it's fairly cut and dry.

Good well done, Cybex! My little one is a big fan!
* This product review was collected by the manufacturer.
By RachelSM25
Brooklyn, NY
Unique features set this car seat apart from other
January 20, 2019
I am a first-time mom of a 10-month-old. This is my first time using an All-In-One car seat. I am currently using the car seat in rear facing mode.

The sensor technology is a unique feature. The most useful feature for me on a day to day basis is that the app shows you the temperature in the car seat. I am always worried about my baby overheating, and he would often get sweaty in his old seat, this prevents it from happening. In terms of safety, it provides peace of mind that your child is bucked in and won't be left in the car if you become absentminded. While placing my groceries in front of my house It alarmed me that my child was left in the car. The feature will also call emergency contact/911 if left for a long period of time. In order to use the sensor, you must make sure that you have an OBDII port available to use in your car for the technology to work. I am supposed to be using the port with my car insurance. The app also comes with digital manuals that are a lot more convenient than using the paper manual.

The fabric and padding feel incredible. I wish I could sit in it myself. The Manhattan Gray color is beautiful and sleek looking.

The buckles are magnetic and will stick to the side of the car seat while placing the child in. It's such a simple concept but it's genius and extremely helpful. It's so much easier to put my child into the seat.

I like that the cup holders can be used or not and you can also buy an additional one if needed. This will be great for the future in case we have more children and require additional car seats in the back.

The mechanics of the car seat are relatively easy to figure out. The only issue I have had is that I have some trouble making the straps tight enough when my child is in the car seat, especially because it's in the rear facing position and I have to pull the strap up instead of out. Pulling the straps to secure the seat to the car is also a big of a challenge.

Overall, I am extremely satisfied with this car seat and I highly recommend it. 
* This product review was collected by the manufacturer.
By KCN10
Marietta, GA
Safe and Stylish
January 20, 2019
The Eternis S is an attractive car seat that feels very high end. You can tell there was a lot of thought put in to the design and materials used. This car seat has some impressive safety features like the Linear Side Impact protection and the Sensorsafe chest clip. Sadly the Sensorsafe was not compatible with my car since it is a 2005. The manual states they have not been tested in cars prior to 2008. The Sensorsafe works great in my husband's car which is a 2014. My little one seems to find it very comfortable and almost always falls asleep while riding in it. One of the things I'm most excited about is that this car seat goes up to 120lbs. So if you think about it, this car seat should pay for itself many times over. While we didn't have the opportunity to use this as an infant car seat, I find it impressive that Cybex was able to design something that can be used from infant to 10 yoa. The only negative thing I have to say is that the installation was a little difficult. I think the instruction manual was partly to blame as it is slightly confusing. With that being said, I would still highly recommend the Eternis S for anyone looking for a car seat. You can tell Cybex takes safety seriously, and their standards are second to none.
* This product review was collected by the manufacturer.
By Denverlady
Denver, CO, USA
Sturdy and comfortable
January 20, 2019
This is a good car seat. Sturdy and well made.
My favourite features are:
1. Rear facing option till 50 pounds.
2. Great recline options- especially for use from birth. Easy to put into different recline positions with guide on side. Head rest also has a recline option.
3. No re-thread height adjustment for head support. Head rest is also the easiest I've used to lift up and down, with the dual button and top and bottom which means you don't have to struggle to get it into position.
4. Fairly easy cover removal. Bottom is clipped in with 3 tabs- these easily pop out once cover is pulled all the way down and then just gently pull plastic seat apart a tiny bit.
5. Nice fabric with good padding.
6. Smart sensor clip to remind you the kid is in the back.
7. A true birth to big kid seat- the booster option allows you to thread a car seat belt easily through the guide at the top- allowing car seat to be used to 120 pounds.
8. Built in storage for straps- both back tether and anchor clips.
9. Fit well in a 2014 rouge and leaf including rear facing.

1. Hard to install using the lower anchor clips, especially in a rear facing position- it took two adults using strength to push the seat down while pulling the straps to install it tight enough- if this car seat had the easy two-step tightening system I'd give it 100%. The anchors do have a nice easy-release which makes uninstalling very easy.
2. It is a heavy seat- although this is only an issue if having to move it around. There is a trade off between quality materials and weight.
* This product review was collected by the manufacturer.
Longevity and Safety!
January 19, 2019
The Cybex Eternis is a premium all-in-one option as you use from birth up to 120 pounds. A car seat you can buy and not have to worry about researching the next stage car seat all over again in a year or two.
We love the safety features such as the SensorSafe technology to let you know if your little one has unclipped their harness (also monitors car temp) via an app on your phone. The other safety feature we like is the LSP system as extra protection in an event of a side impact crash. This is a key feature for us because when our baby girl was 3 weeks old we were hit on her side of the car and she was safe and sound in her Cloud Q with the LSP system extended.
The 3-position reclining headrest on the Eternis is an awesome comfort feature to prevent the forward head lean during those car naps and it's super easy to adjust!
Installation is quite simple and if you install it using the seat belt, the LATCH connectors have a compartment to be stored in instead of just hanging loosely.
We also have the Sirona for our two year old but like that the Eternis will transition into a belt positioning booster unlike the Sirona. We highly recommend the Eternis and Cybex car seats!
* This product review was collected by the manufacturer.
By Crpaulson
Great safety features
January 18, 2019
The Eternis S car seat has safety features that I did not know about prior to this car seat. These include the use of the sensor safe technology that is on the car seat clip and you can plug into your car to ensure you do not leave your child in the car, the temperature of the car, along with if they have been sitting in the car seat too long and may need to stretch (what, so cool!) This may be especially helpful as a car seat for family members who transport your child and may not remember exactly that they are transporting them due to infrequency of the transports. This helps ensure the safety of your child by the side impact technology that I have not seen on any other car seat to date. It is nice that it states that you specifically put it out on the side of the car seat that is closest to the car door and not anywhere else. This car seat is worth the money as it transforms with your child throughout their stages of growth and up to 120 pounds. There are 12 height positions to grow with your child along with the ability to recline the car seat in three positions in case they may need to recline further down or sit up for a trip or so on. There is also a newborn insert that is provided with the car seat which is especially helpful if you have a smaller child using the car seat. My daughter is 16 months old and still uses it as she is a petite little girl and it is helpful for her. The clip in system is much easier than my Graco car seat in words of clipping and unclipping my daughter in and out of the car seat, I don't struggle as much. My daughter likes the use of the cup holder on the side of the car seat and I like that you can take it off to wash it or clean it as needed as we all have accidents that happen. One downfall of the car seat that I have noticed is it would not be beneficial to buy the car seat if you did not have the clip in piece into your car in order to utilize the features associated with it. Also, if you do not have a smart phone if would not be beneficial as you need the app on your phone associated with the car seat sensor. Overall, I would recommend this product to anyone as it is a car seat that can grow with the child for years (as long as it is not expired). Definitely worth the money for the price and ensures the safety of your child which should be of utmost importance.

Caution: This
* This product review was collected by the manufacturer.
By Sreyna
Top notch security features!!
January 17, 2019
This is car seat is by far the best I've seen! It covers all areas of concern for parents. It can be used for infants 4lbs all the way to kids that are 120lbs! It is a very nice seat with soft material. It looks and fits great in my compact suv. Installation was pretty easy just followed the instructions. There will be no more babies getting left in hot vehicles thanks to the Sensor Safe feature. The head rest tilts back for an open airway for babies. It is mind blowing all the thought and safety that was put into this car seat! We travel long distances a lot and thanks to this seat I can travel with peace of mind that by baby is safe and sound. All in all this is a top notch car seat with features out the wazoo. It is worth every penny you spend on it! We love ours!!
* This product review was collected by the manufacturer.
By Mama M.
New Orleans, LA
Great carseat for many reasons
January 17, 2019
We recently moved my 22 month old son to this car seat and have been really pleased. We have installed it rear facing with the shoulder/lap belt and feel that he is really secure. There is plenty of space for the front passenger seat even with the rear-facing recline position, though if he were reclined more it might become an issue. The material of the seat has a nice feel to it and the shoulder strap covers are thin, but very comfortable. The cover is machine washable, but I'll admit that I won't be too excited if we have to disassemble & reassemble everything if we have a reason to clean it. We have a Cybex infant seat and had to machine wash the cover once and I could never get it fitting tight around the edges again, so I fear that might be the case with this one, too! Again, I hope I never have to find out but with a toddler it is probably inevitable! Let's hope it's as easy as the manual makes it seem!

We haven't made any road trips with it yet, but my son has found it cozy enough to take short naps on car rides home in it. I like that it sits lower in the car (our previous seat sat way up high), so it's easy to get him in and out without worrying about hitting his head on the ceiling of the car.

There are so many safety features to this car seat that I am 100% certain my son is safe while in the car. The side impact panel is a great feature for side impact crashes, and the SensorSafe technology is great, too! Installing the SensorSafe sensor was a breeze because the app will tell you exactly where it goes in the make/model/year of your car if you are like me and had no idea where it goes. I admit that I have not done much with the app thus far, but I do love that it allows you to add other adults to your account and it will alert them if it feels there is an unsafe environment/situation. It will tell you if the car is on, the child is clipped in and what the temperature in the car is. I will spend more time soon seeing what else the app offers, but so far the interface is really easy to navigate!

The feature that I love most is when the Sensor chimes when the car is stopped/turned off, the driver door is opened and the child is still buckled in. It's not an annoying sound, but it's a great reminder of your child in the backseat. If the chest clip is not strapped, you won't hear the chimes when you get in and out of the car. The chest clip is definitely a little tougher to get opened and closed because the button on it is stiffer (likely due to the SensorSafe technology), but if you have an older toddler that likes to unbuckle during rides, they likely won't be able to anymore!

All in all, we have been really pleased with the seat & feel it was a wise choice for us!
* This product review was collected by the manufacturer.
By fmarie909
Rancho Cucamonga, Ca
Wonderful Car Seat
January 17, 2019
Absolutely love this car seat!! When I first received it I had a hard time locating the anchors for foreword facing, but was able to find them with the help of the manual. I love how the head part can recline for when my son falls asleep his head isn't falling foreword! The advance technology is amazing your able to download an app and it tells you when the chest clip is connected and the temperature in your car. The only down fall to this car seat is the light colored fabric, I wish it was a bit darker.
* This product review was collected by the manufacturer.
By Esobel9
Dudley, ma
Awesome seat!
January 17, 2019
This seat is awesome. I had a graco and we liked it but the issue for me was securing her in the seat. The straps never let out enough and it was difficult to get her in. With this seat i don't have any of those issues. My daughter has plenty of room to get in and it's much easier for me to make sure she is right and secure in the seat. The other feature of the straps that we love is the padding around the shoulders. It's not too bulky as to hit her face and it's comfortable. She used to complain that the straps from the graco seat would hurt her. She doesn't complain at all anymore. She refers to it as her "Nice seat!"
* This product review was collected by the manufacturer.
By Amber5
The Perfect Car Seat!
January 17, 2019
Straight out of the box - this car seat is a beauty. The fabric is smooth and machine washable.
The padding in the seat cushion is almost like a memory foam pillow. So soft and comfortable.
The tilted headrest is awesome! Finally, my baby's head doesn't fall down while he is sleeping.
The magnetic buckle holders work great. Makes putting my little one in and out of the car seat a breeze.
It has different recline options. 1-4 for rear facing, 5 and 6 are for forward facing. It is easily adjustable while the baby is already in the seat.
Love the Sensorsafe technology. Now that I have it, I'm not sure if I could ever live without it. I downloaded the app, installed the OBD port, and within minutes was good to go. My child is not old enough to unclip himself but I love the fact when he does, I will get notified. Until then, I am enjoying checking what the temperature in the back of the car is and getting notifications when exiting the car.
The Linear Side-impact Protection (L.S.P. System), is easy to click out with the press of a button. Love that safety feature.

I am so impressed with this car seat. Safety features galore and ease of use - this really is the one car seat you will ever need. Such a well thought out and executed product. Love it!
* This product review was collected by the manufacturer.
By erin22
Happy baby, happy parents!
January 16, 2019
We were super excited to receive the new Cybex Eternis S for our 17 month old (and 5 year old!). It is SUCH a versatile seat given the longevity it provides. I mean, the ability to rear face until our baby is 50 lbs?! That's amazing! The other feature we were thrilled with was the SensorSafe technology. It is SUPER easy to install in your vehicle and monitor with your smart device.

Straight out of the box the Eternis S is a thing of beauty. We were highly impressed by the build construction and quality. The fabrics are incredibly soft and the color is very sleek. The seat is HEAVY but that is to be expected with the steel reinforced frame.

I LOVE the removable cup holder and how easily it attaches to the seat. The three position movable recline on the headrest is a feature that I've never seen on a carseat before (and we have five a lot of carseats over the years!). It is super easy to adjust and such a cool added bonus. Another neat feature is the magnetic strap handy when you are getting your child in the seat and you don't want to be fumbling around with the straps.

Adjusting the straps with the no re-thread harness was a total breeze. Everything is labeled very clearly to eliminate any confusion. The straps fit nicely across our daughter's legs, they do not dig in or seem uncomfortable at all. The L.S.P (Linear Side-Impact Protection) pops in and out with the click of a button, we love this added safety feature.

A few (minor) things to note: when clipping and unclipping the chest clip it took a little more wiggling than I am used to, however my five year old was still able to get herself out of the seat when instructed to do so. The SensorSafe is in the chest clip so I imagine that is why it required a little more work. Installing in our 2016 Honda Odyssey was pretty straightforward, however, it did take a few tries to get the seat tight (with the LATCH system). The manual was easy to navigate with helpful instructions and I imagine it will get easier over time. Releasing the LATCH was super easy with the quick release pull tabs.

Overall we are extremely pleased with this carseat. We rate it five stars based on the longevity, quality, and safety features. You will not be disappointed!
* This product review was collected by the manufacturer.
By beachgrl8719
DeBary, FL, United States
Great features!
January 16, 2019
My daughter has been using this car seat for a week now and I am extremely happy with the durability and features of this seat! The seat is heavy duty, sturdy and easy to install either forward or rear facing. The fabric is so soft and comfortable. The recline on the seat is amazing and I do not have to worry about my daughters head falling down when she sleeps. The seat is equipped with linear side impact protection and I feel my child is very safe if there were ever an accident. I absolutely love the scensor safe alert system that I can control using an app on my phone. This way I know if she has taken off her belt or if she has not and has been potentially left in the car. I will immediately be notified. This seat is top of the line and I would highly recommend it to all of my family and friends.
* This product review was collected by the manufacturer.
By Starstruck0508
Amazing car seat!
January 13, 2019
I received the Eternis S with SensorSafe for free to review. I absolutely love this car seat and the features with it! I love how it alerts me when he's buckled or when we unbuckle him. It tells me if it's too cold or hot in the car. The only con, is sometimes it tells me he's still in the car when I already unbuckled him and he's safely with me. The alert to let you know the baby is in the car with you is pretty loud. And it goes off twice when you shut the car off.
* This product review was collected by the manufacturer.
By Lizisaurusrex
Los Angeles, CA, United States
Beautiful with awesome features!
January 11, 2019
Beautiful seat! Love the sensors and the hidden storage for latches. My daughter is comfortable in the seat and I can see this being the last seat I'll need!
* This product review was collected by the manufacturer.
By Kidstuff15
Knoxville, TN
Great car seat that may work well from birth!
January 10, 2019
I was a certified Child Passenger Safety technician several years ago (I have since let my certification lapse) and have installed many different car seats in many different types of vehicles. I have only tried the Eternis S in my vehicle (Toyota Prius V) for my baby (almost 11 months ~18 lbs. and 27" tall). I installed the car seat in our car in the most upright position allowed for rear facing, using the leveling indicator ball, this is the only rear facing position that will allow an adult to ride in the front passenger seat (the car seat takes up this same amount of space all the way to the top harness position). She needs the Eternis headrest high enough that I was able to tilt it back a notch (only headrest positions 4 and higher allow you to tilt the headrest back) which was very nice, she fell asleep and her head did not slump at all. I installed the Sensorsafe app on my iPhone to try it out. It works well and the setup instructions within the app were easy to follow.

I highly recommend the using the seat belt to install this car seat, it was much easier for me to get a tight install with the seat belt than with LATCH. I installed the car seat in my car with the seat belt both rear and forward facing. I was able to get a solid install by just feeding the seat belt through the generously sized belt paths (no scratched hands!), feeding the shoulder belt through the the lock off, and pulling the seat belt with just my hands. I did not have to put my weight in the car seat to get it tight.

I installed the car seat in my car with LATCH both rear and forward facing. The LATCH strap is stored inside a compartment under the seat cover, it is a little bit of a pain to get it out, feed it through the belt path, and replace the seat cover. I really like the pull strap release on the LATCH buckle, it is easier than the push button style. I was able to get tight rear and forward facing installs, but I had to put one knee in the seat and pull the LATCH strap as hard as possible while rocking the seat side to side to get it tight. According to the user manual you must discontinue using LATCH rear facing when baby weighs 35 lbs. and forward facing at 40 lbs.

With the infant insert installed, the shoulder straps are 6 ½" high in the lowest setting and the crotch strap in the inner position is 3" from the seat back.

With the infant insert removed, the shoulder straps are 17 ½" high in the highest setting and the crotch strap in the outer position is 5 ¾" from the seat back.

-Looks like it will work well for a small newborn (deep recline, head rest tilts back automatically in the smaller harness settings, smallest harness setting looks small enough)
-Optional tilt back headrest for the higher harness settings
-High rear facing capacity, 4-50 lbs. and 17"-48"
-High forward facing harnessed capacity, 22-65 lbs. and 28"-49"
-Booster mode, 40-120 lbs. and 44"-57"
-The harness does not have to be removed for booster mode (less likely to lose the parts)
-LATCH, including top tether, can be used to secure the car seat in the vehicle in booster mode
-Seems well cushioned and comfortable for babies and toddlers
-Large belt paths that don't scratch your hand when feeding the seatbelt through
-10 year expiration date
-Retractable L.S.P. only takes up extra width in your car when extended for use
-LATCH strap pull release mechanism is easy to use
-Clear, easy to follow user manual and stickers on the car seat

-Very large seat - 19 ½" wide and takes up a lot of room rear facing front to back if reclined for a small baby, you would need a very large vehicle to be able to recline it deeply enough for a newborn
-Difficult to get a tight LATCH installation
-The seat bottom is very well padded except for the 3" near the seat back which is about half as padded as the rest of of the seat bottom, it seems like this would be uncomfortable for a potty trained child
-The chest clip is stiff to buckle and unbuckle, this may get better with use
-The headrest is difficult to adjust into the lower harness positions (positions 1-2), I was afraid I was going to break it while pushing it down, this may get easier with use

I recommend this car seat, I will still use an infant car seat, Cybex Aton Q, for my next newborn (due in June) because we will not be able to recline the Eternis S enough in our car, but I think this will be an excellent car seat once the baby has enough head control to sit in the most upright rear facing position through to the booster years.

I received this car seat for free in exchange for my honest review.
* This product review was collected by the manufacturer.
By Anibebe
Marietta, GA
Super easy to install!
January 8, 2019
This seat is for my 3.5 year old who is 40" tall and weighs 42 lbs. She'd grown out of her Evenflo Safemax car seat and so we were looking for a booster seat that would carry her all the way until she didn't need one anymore. It's incredibly comfy and very easy to install (we did the tether and the seatbelt through the back). All in all installation took 5 minutes which helps when you have two kids! The cup holder just slotted into place as well. I love Cybex products for their quality and ease of use and this seat is no exception. The sensor safe is a nice option too which allows us to understand when the kids need a break during a road trip. Very happy with this car seat indeed and i'll Be recommending it to all my friends!
* This product review was collected by the manufacturer.

1 Question & 1 Answer
from CA asked:
September 20, 2019
Dose the cover come off and can be machine washed ?

1 Answer
Submitted by: Ilan Liipper on September 20, 2019

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