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Diono Radian 3RXT All-in-One Convertible Car Seat 2019 Black

Share Diono Radian 3RXT All-in-One Convertible Car Seat 2019 Black

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Your child’s security is Diono's top priority. We engineered our radian® 3rXT with premium, innovative features like a steel alloy frame, aluminum reinforced sidewalls, energy absorbing EPS foam and a reinforced adjustable head support to keep your little one protected and comfortable.

Joy of the journey

From birth, keep your little one rear facing longer to 45 lbs traveling safely. As they grow to 120 lbs (12 years approx.) our long-range lifespan protects your child facing forwards. Peace of mind for you, we’ve thought of everything so you don’t have to.

Lovingly engineered

The radian® 3RXT is fabricated using super strong automotive high strength steel, engineered into a dual spine. This unique core manages and dissipates energy and provides an unyielding structure to protect your baby. We shield your precious child through Super side impact protection with aluminium reinforcement.

Three’s not a crowd

For safety that fits 3 across the radian® 3RXT packs all our innovative safety features into a sleek and slim design that allows you to fit three across (in most mid-size vehicles). Now the whole family can travel, together.

First Class comfort

Inspired by the best European fashions, our radian® 3RXT has soft fabric covers and a memory foam seat base bottom. Lined with thick energy absorbing foam, comfort and safety go hand in hand. A tailored infant support cushion and a cup holder are included.

Made of Seattle

We are from Seattle, a city where being different is the norm and so is the radian® 3RXT. It folds flat, so you can travel the world and is FAA approved for use on an aircraft. You don’t need to change just because baby is in tow.


  • Child weight: Birth to 120 lbs
  • Dimensions: 16 L x 15 W x 28.5 H
  • Seat Weight: 27.68 lbs

Review Summary
141 Reviews
84% (119)
12% (17)
1% (2)
1% (2)
1% (1)
96% Recommend this product (135 of 141 responses)
By Brooke
Love diono
September 10, 2021
We love our Diono carseats! Both our kids have them now. Although they are a heavier carseat I love the comfort and design they provide. My favorite feature is the ratchet tightening.
By Maria
Bloomfield hills mi
Best car seat
September 7, 2021
This is the best car seat ever! I love that baby can see the road and it has a cup holder and it has sides for safety.
By Joseph
Woodbine, Georgia
Best package and price
September 6, 2021
This is a great seat for smaller backseats. The three across capability is amazing.
  • solid
  • safe
  • great price point
  • heavy
By Katia
Comfortable and compact, sturdy
August 20, 2021
We were recently rear-ended and needed to replace our car seats. After lots of safety research I chose this one for our tall and slim 5 year old as I wanted a metal frame and we will need to fit 3 across in a couple of months. She is very comfortable and happy in it! She asked if she could get another one to replace the full-sized car seat in her dad's car. Great safety ratings + comfortable kid is a win!
By Sarah
Bozeman, MT
Great for my 3 year old
June 20, 2021
We love the slim profile and sleek design of the Diono seats and much prefer this model with the headrests.
  • Head rest
  • Slim design
Best UsesFront facing 5 point harness
By Amanda
Syracuse, NY
Best narrow carseat for 3 across in a sedan
May 11, 2021
We love our Diono! My son prefers it to his car seat with cupholders and all the extras. So slim and easy to install. Feels extremely safe. Will be purchasing more in the future.
By Ashleigh
Roseville , CA
April 24, 2021
Easy to install , my daughter fit perfect in it she loved it, it also fit perfectly in our car! This Is our 3rd diono they will forever be our favorite car seat !
By Alicia
Great all in one car seat
April 6, 2021
I love the color the Car seat feels very safe and my daughter actually sleeps in it ! I love this. Buy it !
  • Color safety size
  • No instructions in box that could find
By Samantha
Rochester, NY
My favorite car seat brand
April 3, 2021
I have purchased Diono car seats for all of my kids so far and haven’t been disappointed. Our car is pretty small, but we were able to put three of these in the backseat with no problem. Also the installation is pretty easy.
By Ashley
SPICA Cast Approved
April 2, 2021
Our 8 month old was being placed into a SPICA cast after her hip dysplasia procedure. I saw in a spica group that this car seat has worked well with fitting baby in the spica cast and they were 100% correct. The seat is heavy and definitely takes up a lot of space in our jeep Cherokee, but it works with baby’s spica cast and is keeping her safe. Car seat arrived quickly and in perfect condition.
  • Spica cast approved, fast shipping
  • Heavy seat
Best UsesSpica cast
By Kaitlin M.
Northern Virginia
Wait for a sale!
March 26, 2021
I got this package for a steal on Black Friday! It was an awesome value but would wait til a similar sale goes on. It’s easy to install. Feels extremely secure and the extras included are great. I love the seat protector pad and the two cup holders for her drink and her small stuffed animal to sit in :)
By Gmom
March 17, 2021
So happy we picked this up. The bonus pack has everything you’ll need to keep both baby and parents happy. As grandparents we wanted the same car seat my children have in their own vehicles and we couldn’t be happier in choosing this one. I really like where that the buckle is surrounded by fabric so no need you’ll pinch the baby’s skin while securing the straps. Well made, stylish and the price can’t be beat!
  • Peace of mind your baby is safely secured in a well
  • constructed seat.
  • In my vehicle (while rear facing) you can?t adjust the front seat to go back any further because it leans up agar the seat. A small price to pay for safety so I am in no way complaining. It?s a great safety seat for sure.
Best UsesSurrounded your baby in safety and stylish seating. Peace of mind. Can be used from newborn up- thats a plus.
By Kristy
March 16, 2021
Love the quality of these seats! So easy to remove covers and clean. They are heavy so not super easy to move from car to car, but totally worth it for all of the safety offered for your child! We have identical triplets, so we have 3 in a row across our middle seat, and they fit perfect!
By Anonymous
Awesome seat and ordering process
March 8, 2021
No surprise that this is a great car seat. My 4 year-old seems comfortable and happy and it provides enough room to have another car seat next to it in the middle seat (not another Diono, a Cosco Scenera Next for what it's worth...but may get another Diono now). Other than that, LOVE ALBEE BABY. Love that it's a NYC business (local for me) and have always received things quickly and in great shape and the prices are great. I try to order baby gear from here rather than Amazon or another big box store whenever I can.
By Shay
Love it
March 3, 2021
Great deal on this set
By Anna
Diono 2020 Radian
March 1, 2021
This kit has all you need. The slender seat fits easily without being bulky. It has a steel frame so feel confident moving to this seat with the hardness. Then we can move to the booster setting.
By Shawnee
Great Carseat
February 26, 2021
My 3 year old has been using this car seat for a few months now and has been loving it(it’s his race car driver seat) unfortunately I’ve had to wash it several time due to potty training, and the Velcro has tore up the back of the cover pretty bad! Along with that the memory foam pad takes a really long time to dry, not the car seats fault just wish I’d known so I could have taken better care of it!
  • Good heavy car seat.
  • Velcro tears up cover when washing!
Best UsesGreat forward facing seat, this would never fit in my car as a rear facing seat!
By Calie
North Carolina
Very happy
February 23, 2021
These are the only car seats I will buy for my older kids now. I am so happy with how sturdy they are and how it is now possible to fit three kids across the seat of the car. These car seats are incredibly sturdy and attractive as well. Very happy!
By E E.
Tucson, AZ
Best car seat brand
February 20, 2021
We love this seat so much we bought one for our friends who are expecting and are preparing to buy another one (newer model) for our newest arrival! Cant beat a Diono!
By E E.
Tucson, AZ
Fantastic seat
February 20, 2021
This is a wonderful carseat and we are so excited that it will grow with our child until they no longer need to be in a five point harness. Great service and quick delivery from Albee. Very pleased with our purchase.
By Cassandra
Love this!
February 19, 2021
This bundle is absolutely amazing! I have a smaller SUV and it allows me to put three across. Love the colors as well
By Crystal
So happy
February 6, 2021
This is the seat we wanted and we got a great deal here and it shipped fast and arrived as described him with everything that it said it would we are very happy we will be shopping here again
By Binoj
Great car seat
February 5, 2021
Very comfy carseat for my 20m old. We kept it rear facing and she enjoys seeing the mirror placed in front of her.
  • Compact
  • Leg space reduces for the driver if you keep rear facing(it is applicable for all car seats)
Best UsesCan use this upto the age kids stop using car seats.
By Melisa
Dallas, Texas
February 1, 2021
This is our second purchase of the 2020 Diono Radian 3RXT. We loved the all black one and decided to get a new one for our second vehicle and our new baby on the way. My 15 month old loves his car seat. Super comfy and not to bulky for the car. Will probably order 2 more with new baby on the way!
  • Slim car seat
  • Heavy to move around from car to car
By AprilS
Houston, Tx
Amazing Car Seat
January 27, 2021
Wish we would’ve purchased sooner! Sturdy, gorgeous color and my kids say they’re super comfy! My 6months old baby fell asleep in his, he hated his old one screamed the whole time we’d be in the car.
  • Comfortable
  • Sturdy
  • Great color
By Adam
Santa Barbara, ca
Heavy, sturdy, not the tightest fitting seat
January 27, 2021
It’s heavy. It feels sturdy. But it’s not the tightest fit. Having two britax clicktight seats, I’m used to the burly heavy secure seat. This is not quite that. It’s ok. I feel fine using it. But the bottom can move if pushed. The hand tightening of the various straps and anchors is not the best approach. For this reason britax has been my gold standard of secure. But it’s a smaller car and I like having a seat that can travel with more ease. 3 of 5
  • Seat guards really only serve to add a layer of risk for looser fit.
By Miranda
Durham NC
Excellent seat, excellent price
January 22, 2021
This seat met all my expectations - we have an older version of this seat that we've been using for 10 years, and it hasn't changed much. The addition of a cupholder is nice (although I had to find a YouTube video to install it!) and the buckle is much easier to open (great for parents and kids that are responsible for their own buckles, less good for kids that like to unbuckle themselves during the ride). The newer LATCH attachments are also easier to use. This is still the best seat for 3 across, my two older children are riding comfortably on either side of it. And I have full confidence that my child is as safe as we can make him in this seat. It is extremely solid (and heavy) and well made. I like the head protection on the sides, it gives him a place to rest his head when he's tired. We didn't use most of the bonus accessories, but they are nice, and we'd likely have used them if we had an infant. Surprisingly, we didn't receive an installation manual with the seat, but it was easy to look it up online.
  • 3 across
  • Low-profile
  • Comfortable
  • Easy to buckle
  • Excellent sale price
  • No installation manual in box (likely a mistake)
  • Strap cushions are huge and unwieldy - we chose to remove them. Other seats have more comfortable ones, and we might replace these with something more manageable.
Best Uses3 across Older children
By Lauren S.
Belleville, MI
Love this car seat
January 20, 2021
We purchased two of these seats a couple of years ago for our twins and love them! They’re heavy duty and make us feel like our kids are very safe. We needed a new seat for our one year old, and Albee Baby had the best deal we could find. Shipping was fast too.
By Alina
Great narrow seats!
January 14, 2021
I love these seats. I have a Yukon XL and the third row seat is definitely limited on space. With three kids in car seats (and 5 kids total!) I have to be very picky with the car seats I buy. Did a lot of research and measuring to decide on these. And they do not disappoint! They are heavy for sure, but I didn’t find them as difficult to install as other reviews said. I love the fact that even the back is covered nicely with the neoprene cover, the manual is neatly tucked into a pocket on the back- that took me a bit and a YouTube video to figure out! ;) I used the seat belt passed through the proper path in the seat and adjusted the angle so they reclined a bit and then used the head rest tether for added security. Was able to put three seats across- these diono seats, and then squeezed a booster for my big girl in the middle, thereby freeing up both captain seats in the second row! I’m thrilled.

The bonus pack stuff is nice too, though I havent used it yet. Came with a lot of diono brand baby car gear- cool mirror for rear facing kiddos, nice seat protectors, and organizer caddies, etc.
By Jnicole24
Not a true all in one
January 8, 2021
The seat itself is very well made, feels solid and comfy. However, I bought this for my 4yo to be used as a harness to booster. His shoulders are about 1" from hitting the head rest and it's not adjustable.
  • Narrow
  • Not an all in one
  • Doesn't work as a booster
Best UsesWhen space is limited Rear/forward harness only
By Meleah
Saved my children in a car crash
December 26, 2020
We just bought our second set after we were in an awful accident on Christmas Day. The car got totaled but the kids and the car seats were untouched! I’ll never own another car seat!!!
  • Life saver, so sturdy
  • Heavy but that?s what you want !!
Best UsesPut in car and don?t take out!
By Andy
New car seat
December 25, 2020
Baby grew out of her infant car seat and purchased this one. Could not be happier with my choice.
By Mei
Seattle, WA
Sturdy and simple
December 21, 2020
Great seat. We struggled to find one that worked. We had graco slimfit but the buckle hurt my baby's thighs or seemed like it did because he would cry whenever we put him in the carseat. We got diono bc we heard it was good and our family member had it.

It was easy to set up and it came w a lot of accessories. More than we needed tbh. I wished that they noted where the instructions were but I had to Google to figure it out. Hint, it's on the side of the seat.
  • Safety, adjustable, sturdy, comfort
  • Price, heavy (hard to switch cars but doable if needed)
By Maggie
Sandy, UT
3rd D Radian Purchase
December 15, 2020
This is our third, love the stability and safety of these seats.
By Jenna
Fort Myers, FL
Great narrow car seat
December 11, 2020
We needed to buy a new car seat to fit 3 across in our jeep, this is wonderful, narrow and sturdy. It is heavy, but you can tell it’s made for safety. My 3 year old
Loves it
  • Narrow, easy installation
By Kay
Good car seat, good deal
November 30, 2020
We bought this seat specifically because we wanted the “three across†for our vehicle when we eventually have a third child. So far we are happy with it. I don’t think it was too difficult to install. The fabric seems good quality and I like that it came with all the accessories. I don’t know if there is another seat on the market that is as narrow at the base as this one so I don’t know if this is the cheapest one out there but it was on sale so that I felt like I was getting a deal. I actually went back and bought a second of this same car seat for our other car. I’ll keep my eye out for more deals but I feel like this was a good buy.
  • Narrow base for having multiple seats in one row.
  • Good quality fabric.
  • Two cup holders and multiple other accessories.
  • Memory foam seat.
  • Difficult to find instruction manual (was eventually found inside the fabric in a pouch, in Diono?s defense there was a little book symbol outside on the outside fabric to show this but I somehow missed it).
  • Some muscle is needed to cinch the seat down.
  • It comes with accessories you may not need (we already had a mirror so we didn?t need the one it came with).
  • Can be pricier than other seats.
  • Takes up a lot of room when rear facing.
Best UsesThree across in a row
By Skyler
Amazing Car seat!
November 27, 2020
I bought this so I could fit three car seats across in a small SUV (two toddlers and a baby). My son loves it and I was very happy to find something that was small enough but still very safe. I also like that it can grow with my child and be used a long time. Well worth the money!
Best Usesto fit multiple car seats in the same row!
By Andrew
Solid Build!
November 25, 2020
This thing feels very stout! We have had it about eight months now and it has held up well to the wear and tear of toddler grime, goldfish snacks, markers with missing caps, etc.
  • Narrow width
  • Ability to use the Angle Adjuster (if needed)
  • Solid build
  • Extended Rear Facing ability
  • Adjusting the strap positions is not as easy as other car seats we have used in the past.
By Laura
Forward facing
November 11, 2020
We needed three car seats across our Ford Edge. This fits nicely in the center facing the window. My daughter thinks she’s a grown up now that she can see out the windshield. And we feel safe knowing she’s secure in this car seat.
By Laura
Rear facing
November 11, 2020
We needed three car seats. This one needed to be rear facing. And it’s a perfect fit for behind the driver seat, even with my 6 foot tall husband driving.
By Wilson
Boston, MA
Slim fit, perfect to combine with other car seats
November 4, 2020
We couldn’t fit two Nuna Rava convertible car seats in our vehicles so we started looking at other brands that were built to accommodate smaller vehicles. That’s how we found Diono. The quality is not up to par with Nuna or Uppa Baby but slim fit was the key and it does the trick. It’s also not as easy to install but we got it done. Overall, we are happy with the purchase.
By Speight F.
North Carolina
Awesome car seat!
October 22, 2020
We have 3 for our subaru outback. all 3 fit in back seat. They are the most well made seats ive ever seen. The kids love them. Easy to use. Can't say enough good things about it.
  • steel frame, easy to adjust, easy to install, easy to clean, etc..
  • a little heavy
Best Useskids safety
By Colette R.
Kansas City
Great car seat-
October 16, 2020
My two year old loves this! Fits comfortable and all!
By Jaime
Bought two of these
October 7, 2020
I think these are great they fit well and are reasonably easy to install. Would highly recommend.
By Kate
October 1, 2020
Complex installation rules but fits three across, which is why I bought it!
By Melanie K.
San Diego
Works for my needs
September 19, 2020
Mostly good! Fabric is great and I love the low profile. I wish it had a built in lock off but it does not so it’s hard to make sure it’s installed tight enough but it allows me 3 across so I can deal with that.

The cushions for the straps around the chest clip are really think and a little awkward so it’s also hard to tighten it enough. Seems like it’s too loose because of the big cushion but the cushion doesn’t extend by the shoulder so when I tighten it more my daughter complains that it’s too tight by her shoulders.

My biggest complaint is rear facing takes up tons of room. My front seat has to be pushed way up. I’m going to try Diono a angle adjuster to see if that helps.

Good seat with minor inconveniences but makes it so I don’t need to buy a new car so I’ll deal.

For reference I have 2 Dionos and a britax infant seat in my 2010 Jeep Compass.
  • Low profile
  • Narrow for 3 across
  • Nice fabric
  • Hard to install properly
  • Takes up too much space when rear facing
Best Uses3 across
By Pat
Arlington Hts Il
September 11, 2020
Unable to review as this was a gift. Recipients have not used this as baby is due in October. All I know was this was recommended to them by a friend who was happy with this product.
By Reagan G.
Lakewood Ranch, FL
Awesome deal!
September 10, 2020
This is such a great bundle for the price, especially when having to buy 2 car seats. This seat is super heavy and heavy duty. It’s nice and narrow which is great for smaller cars/ SUVs that have more than 1 car seat!
By Kelsey
Really fit 3 across
September 6, 2020
These car seats Definitely do fit three across even on a smaller bench. This model doesn't zip down the back of the car seat so all the spare pieces are exposed with isn't ideal while rear facing. I have also noticed that the shoulder straps are too close together on older kids and bother their necks. My kids also complain that their backs start to hurt on longer drives. Maybe they just got spoiled in their old seats (nextfit) but those no longer fit in our car.
Install is more difficult than I would like the instructions aren't super helpful and the youtube videos are lacking as well. The latches are very difficult to pull tight enough in a forward facing position. But if you lean the seat back, it's possible to pull them slightly tighter before putting the seat back upright.
Rear facing latch install with three across is tricky but possible.
  • Fit 3 across, infant to toddler, all parts included.
  • Heavy, difficult to install, harness rubs neck, possibly uncomfortable for child's back, overly complicated set up for different positions/install methods.
Best UsesShort trips daily. Not for traveling. Small cars where you need to fit 3 across. If you don't need three across, get something else.
By Sabreen
Sacramento, CA
Sturdy and intuitive
September 3, 2020
Love it! Very strong and safe seat. You can tell that they really thought about what kids/parents need when creating this seat. It’s complicated to install because there are different requirements for different weights. Great safe car seat that will last a long time.

1 Question & 1 Answer
from CA asked:
August 27, 2018
hi, Does this one come with the cup holder? Thank you
1 Answer
A cupholder is included.
Submitted by: Ilan Liipper on September 3, 2018

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