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Diono Radian 3RXT All-in-One Convertible Car Seat 2019 Grey Dark Wool

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Your child’s security is our 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.

Extended rear-facing

The radian® 3rXT keeps children comfortably rear-facing from 5-45 pounds for the safest possible position. Premium, plush head and body support cushions are included for newborns and infants.

Room to grow

Accommodates forward-facing children up to 65 pounds in a 5-point harness and converts to booster mode for kids 50-120 pounds. The aluminum reinforced, adjustable head support and sidewalls provide additional side impact protection.

Worth the Weight

Our convertible car seats are made from steel for safety you can feel. The fully integrated steel frame is wrapped in thick engineered plastic to withstand severe crash forces. Deep, aluminum reinforced sidewalls provide excellent side impact protection, while energy absorbing EPS foam surrounds your.
  • 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® 3 rXT 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® 3 rXT 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® 3 rXT 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® 3 rXT. 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.
  • Dimensions (in): 16 L x 17 W x 28.5 H

out of 5.0
146 Reviews
Ratings Snapshot
5 Star
84% (122)
4 Star
12% (18)
3 Star
2% (3)
2 Star
1% (2)
1 Star
1% (1)
of Reviewers
Best car seat
By Monica
from Abilene, Texas
on June 18, 2022
Verified Buyer
I personally love how different these car seats are. They are slender so they fit really well in my car, also I love how comfortable my kids are in them.
  • Style, easy to install, comfortable, easy to clean.
Works only in certain installations
from San Diego, CA
on April 26, 2022
Verified Buyer
Bought this to use for grandparents car and travel. To make the rear-facing install work we had to buy an extra accessory and also put the seats all the way forward due to the very high seatback and be sure not to adjust them because a tether required installation. This didn't work out for a grandparent car seat, but we did use it for travel once old enough to forward face. For travel, this was heavy but useful in front facing installation and allowed 2 small adults to sit with it in the backseat.
Favorite convertible seat
By Heidi
from PA
on December 30, 2021
Verified Buyer
I have been using Diono convertible seats since the days they were Sunshine Kids branding. They have come a long way and this is by far my favorite style. I love the fabric covers the back of the seat and protects my vehicle seats. Very easy to install. This colorway is gorgeous!
  • Fabric covers back of seat to protect vehicle seat
  • Easy install
  • Comfortable for kids
solid carseat
By Tarrah
from ,
on November 26, 2021
Verified Buyer
This carseat works well for needing 3 across in a smaller vehicle. The install is a little more difficult than others but overall a sturdy seat.
Money well spent!
By Luis
from Houston, TX
on October 27, 2021
Verified Buyer
10 months later and this is by far my favorite car seat of the many weve owned. Other than the first and second time this was installed in our vehicles, its not that difficult to install. Especially now that my son is facing forward, its very quick and easy to set up. It is very heavy, but not bad if you are only moving it every now and then. Its roomy, seems/looks very comfortable from the first time my son sat in it. In certain situations, Ive had to have my 5yo son sit in it and its a quick adjustment to size it for him which is a big plus for me.
  • Spacious
  • Comfortable
  • Safety
  • Removable/optional cupholder/s
  • Heavy
Love diono
By Brooke
from California
on September 10, 2021
Verified Buyer
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.
Best car seat
By Maria
from Bloomfield hills mi
on September 7, 2021
Verified Buyer
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.
Best package and price
By Joseph
from Woodbine, Georgia
on September 6, 2021
Verified Buyer
This is a great seat for smaller backseats. The three across capability is amazing.
  • solid
  • safe
  • great price point
  • heavy
Comfortable and compact, sturdy
By Katia
from PA
on August 20, 2021
Verified Buyer
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!
Great for my 3 year old
By Sarah
from Bozeman, MT
on June 20, 2021
Verified Buyer
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 Uses
  • Front facing 5 point harness
Best narrow carseat for 3 across in a sedan
By Amanda
from Syracuse, NY
on May 11, 2021
Verified Buyer
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
from Roseville , CA
on April 24, 2021
Verified Buyer
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 !
Great all in one car seat
By Alicia
from California
on April 6, 2021
Verified Buyer
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
My favorite car seat brand
By Samantha
from Rochester, NY
on April 3, 2021
Verified Buyer
I have purchased Diono car seats for all of my kids so far and havent 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.
SPICA Cast Approved
By Ashley
from Pennsylvania
on April 2, 2021
Verified Buyer
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 babys spica cast and is keeping her safe. Car seat arrived quickly and in perfect condition.
  • Spica cast approved, fast shipping
Best Uses
  • Spica cast
  • Heavy seat
Wait for a sale!
By Kaitlin M.
from Northern Virginia
on March 26, 2021
Verified Buyer
I got this package for a steal on Black Friday! It was an awesome value but would wait til a similar sale goes on. Its 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
from Pennsylvania
on March 17, 2021
Verified Buyer
So happy we picked this up. The bonus pack has everything youll 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 couldnt be happier in choosing this one. I really like where that the buckle is surrounded by fabric so no need youll pinch the babys skin while securing the straps. Well made, stylish and the price cant be beat!
  • Peace of mind your baby is safely secured in a well
  • constructed seat.
Best Uses
  • Surrounded your baby in safety and stylish seating. Peace of mind. Can be used from newborn up- thats a plus.
  • 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.
By Kristy
from Montana
on March 16, 2021
Verified Buyer
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!
Awesome seat and ordering process
By Anonymous
from Brooklyn
on March 8, 2021
Verified Buyer
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.
Love it
By Shay
from Texas
on March 3, 2021
Verified Buyer
Great deal on this set
Diono 2020 Radian
By Anna
from Minneapolis
on March 1, 2021
Verified Buyer
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.
Great Carseat
By Shawnee
from Utah
on February 26, 2021
Verified Buyer
My 3 year old has been using this car seat for a few months now and has been loving it(its his race car driver seat) unfortunately Ive 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 Id known so I could have taken better care of it!
  • Good heavy car seat.
Best Uses
  • Great forward facing seat, this would never fit in my car as a rear facing seat!
  • Velcro tears up cover when washing!
Very happy
By Calie
from North Carolina
on February 23, 2021
Verified Buyer
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!
Best car seat brand
By E E.
from Tucson, AZ
on February 20, 2021
Verified Buyer
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!
Fantastic seat
By E E.
from Tucson, AZ
on February 20, 2021
Verified Buyer
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.
Love this!
By Cassandra
from Massachusetts
on February 19, 2021
Verified Buyer
This bundle is absolutely amazing! I have a smaller SUV and it allows me to put three across. Love the colors as well
So happy
By Crystal
from 43506
on February 6, 2021
Verified Buyer
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
Great car seat
By Binoj
from Pittsburgh
on February 5, 2021
Verified Buyer
Very comfy carseat for my 20m old. We kept it rear facing and she enjoys seeing the mirror placed in front of her.
  • Compact
Best Uses
  • Can use this upto the age kids stop using car seats.
  • Leg space reduces for the driver if you keep rear facing(it is applicable for all car seats)
By Melisa
from Dallas, Texas
on February 1, 2021
Verified Buyer
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
Amazing Car Seat
By AprilS
from Houston, Tx
on January 27, 2021
Verified Buyer
Wish we wouldve purchased sooner! Sturdy, gorgeous color and my kids say theyre super comfy! My 6months old baby fell asleep in his, he hated his old one screamed the whole time wed be in the car.
  • Comfortable
  • Sturdy
  • Great color
Heavy, sturdy, not the tightest fitting seat
By Adam
from Santa Barbara, ca
on January 27, 2021
Verified Buyer
Its heavy. It feels sturdy. But its not the tightest fit. Having two britax clicktight seats, Im used to the burly heavy secure seat. This is not quite that. Its 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 its 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.
Excellent seat, excellent price
By Miranda
from Durham NC
on January 22, 2021
Verified Buyer
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
Best Uses
  • 3 across
  • Older children
  • 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.
Love this car seat
By Lauren S.
from Belleville, MI
on January 20, 2021
Verified Buyer
We purchased two of these seats a couple of years ago for our twins and love them! Theyre 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.
Great narrow seats!
By Alina
from Virginia
on January 14, 2021
Verified Buyer
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 didnt 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! Im 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.
Customer Images
Not a true all in one
By Jnicole24
from Wa
on January 8, 2021
Verified Buyer
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
Best Uses
  • When space is limited
  • Rear/forward harness only
  • Not an all in one
  • Doesn't work as a booster
Saved my children in a car crash
By Meleah
from CT
on December 26, 2020
Verified Buyer
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! Ill never own another car seat!!!
  • Life saver, so sturdy
Best Uses
  • Put in car and don?t take out!
  • Heavy but that?s what you want !!
New car seat
By Andy
from Michigan
on December 25, 2020
Verified Buyer
Baby grew out of her infant car seat and purchased this one. Could not be happier with my choice.
Sturdy and simple
By Mei
from Seattle, WA
on December 21, 2020
Verified Buyer
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)
3rd D Radian Purchase
By Maggie
from Sandy, UT
on December 15, 2020
Verified Buyer
This is our third, love the stability and safety of these seats.
Great narrow car seat
By Jenna
from Fort Myers, FL
on December 11, 2020
Verified Buyer
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 its made for safety. My 3 year old
Loves it
  • Narrow, easy installation
Good car seat, good deal
By Kay
from USA
on November 30, 2020
Verified Buyer
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 dont think it was too difficult to install. The fabric seems good quality and I like that it came with all the accessories. I dont know if there is another seat on the market that is as narrow at the base as this one so I dont 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. Ill 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.
Best Uses
  • Three across in a row
  • 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.
Amazing Car seat!
By Skyler
from Maryland
on November 27, 2020
Verified Buyer
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 Uses
  • to fit multiple car seats in the same row!
Solid Build!
By Andrew
from Texas
on November 25, 2020
Verified Buyer
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.
Forward facing
By Laura
from California
on November 11, 2020
Verified Buyer
We needed three car seats across our Ford Edge. This fits nicely in the center facing the window. My daughter thinks shes a grown up now that she can see out the windshield. And we feel safe knowing shes secure in this car seat.
Rear facing
By Laura
from California
on November 11, 2020
Verified Buyer
We needed three car seats. This one needed to be rear facing. And its a perfect fit for behind the driver seat, even with my 6 foot tall husband driving.
Slim fit, perfect to combine with other car seats
By Wilson
from Boston, MA
on November 4, 2020
Verified Buyer
We couldnt fit two Nuna Rava convertible car seats in our vehicles so we started looking at other brands that were built to accommodate smaller vehicles. Thats 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. Its also not as easy to install but we got it done. Overall, we are happy with the purchase.
Awesome car seat!
By Speight F.
from North Carolina
on October 22, 2020
Verified Buyer
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..
Best Uses
  • kids safety
  • a little heavy
Great car seat-
By Colette R.
from Kansas City
on October 16, 2020
Verified Buyer
My two year old loves this! Fits comfortable and all!
Bought two of these
By Jaime
from Colorado
on October 7, 2020
Verified Buyer
I think these are great they fit well and are reasonably easy to install. Would highly recommend.
By Kate
from Ohio
on October 1, 2020
Verified Buyer
Complex installation rules but fits three across, which is why I bought it!

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