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Diono Radian RXT Convertible Car Seat - Spring

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Diono Radian RXT Convertible Car Seat - Spring - Diono  - Babies"R"Us
Diono Radian RXT Convertible Car Seat - Spring - Diono  - Babies"R"Us
Diono Radian RXT Convertible Car Seat - Spring - Diono  - Babies"R"Us
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  • $299.99
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Thanks to a versatile design, the Diono RadianRXT Birth to Booster Car Seat could be the only seat you'll ever need. With its adjustable features, this seat can safely accommodate children from birth until they have grown to 120 pounds and 57 inches tall. The RadianRXT is designed with your child's security and safety as top priorities. Premium materials and thoughtful safety features like a steel alloy frame, aluminum reinforced side walls, energy absorbing EPS foam, a five-point harness, and adjustable head support keep your mind at ease as your little one stays safe and sound.

  • Seat features three modes to accommodate growing children
  • Designed with a steel alloy frame and energy absorbing EPS foam
  • Reinforced head support for additional side impact protection
  • Easy-to-clean cover is soft against child's skin
  • Memory foam padding for extra comfort
  • SuperLATCH for a secure installation
  • Five-point harness provides dependable security
  • Infant support cushions keep your baby positioned correctly
  • Approved for use on airplanes
  • Age/Weight Requirements: 5 - 45 pounds rear-facing; 20 - 80 pounds forward-facing. Booster mode fits children weighing up to 120 pounds or up to 57 inches tall
  • Assembly Requirements: Some assembly required
  • Warranty: One-year limited warranty

Included in the Box

RadianRXT Spring Birth to Booster Car Seat, rear-facing base, infant support cushions, SafeStop harness, rear-facing tether connector strap, one cup holder, and instruction manual.

*For vehicles manufactured AFTER September 2005. For vehicles manufactured prior to September 2005, consult the vehicle owner's manual for lower anchor weight limits.

Trademark Information:

RadianRXT Convertible plus Booster Car Seat (Spring) Product Image


Steel Alloy Frame

Steel Alloy Frame Padded with EPS Foam Protects Your Child

The RadianRXT features a steel alloy frame for a strong foundation. Aluminum reinforced side walls and head support are lined with thick, energy absorbing EPS foam for side impact protection. The SafeStop energy absorbing harness provides extra protection for children 20 to 40 pounds. When installed, the harness's bungee-like energy absorption reduces impact when your child is seated in the forward-facing position. Additionally, the RadianRXT boasts rear-facing tether capability to reduce seat rotation in the event of an impact.

Accomodates Growing Children

Versatile Seat Grows With Your Child

The RadianRXT offers the adaptability you need to keep your child's car rides safe and comfortable. The seat fits children in the rear-facing position from 5 to 45 pounds and from 20 to 80 pounds in the forward-facing position. An adjustable, reinforced head support with 12 height settings ensures a custom fit and offers additional side impact safety. With longevity in mind, this model converts to a booster seat for kids up to 120 pounds.

Rear-Facing Position

Deep Seat Design and Plush Cover for a Comfy Ride

All Radian seats have a deep shell to cradle your child for a more comfortable rear-facing ride and to provide a higher rear-facing capacity. A plush cloth surface feels soft against your little one's skin. Expandable sides and a longer seat bottom offer better leg support and help keep children cradled in a custom fit that adapts throughout their physical development. Two forward-facing recline positions allow the RadianRXT to fit a wide variety of vehicle seats. Body support cushions keep infants and babies snug and positioned correctly.

SuperLATCH Installation

SuperLATCH Feature for Secure Installation

Diono's SuperLATCH feature makes use of your car's LATCH system to take advantage of the RadianRXT's full weight capacity.* The SuperLATCH connectors are successfully crash tested for children weighing up to 45 pounds rear-facing and up to 80 pounds forward-facing. In vehicles with LATCH anchors, SuperLATCH is a safe, convenient way to install the RadianRXT. Rubber bottom grips protect your car's upholstery and ensure the seat won't slide after installation.

Compact Design

Slim Profile and Convenient Features

A slim profile means the RadianRXT can sit three across in most vehicles. Because it doesn't have a pedestal, the seat sits relatively low which allows the child to board with ease. The seat folds up when not in use, so storing or transporting the seat is easy. The machine-washable cover and cup holder compatibility (one included, you can add up to four per seat) make this car seat even more convenient.

NCAP Crash Tested

Testing and Warranty Information

This car seat surpasses federal crash test standards and meets NCAP standards, the industry benchmark for verifying child seat performance in severe accident conditions. The RXT is tested at its maximum forward-facing, rear-facing and booster weight capacities and is rated for an impressive 10 years of life. The car seat is also FAA approved for use on airplanes. The Diono RadianRXT Birth to Booster Car Seat is backed by a manufacturer's limited one-year warranty.

Product Description

The Diono RadianRXT is a highly versatile car seat that could be the only seat you'll ever need. It comfortably seats rear-facing children from 5-45 lbs, forward-facing children from 20-80 lbs in 5-point harness, then converts to a booster for children up to 120 lbs. It's built for strength and safety with a steel alloy frame, reinforced sidewalls, adjustable head support and our patented SafeStop energy absorbing harness. EPS foam surrounds the child's head and body to provide complete side impact protection. Our unique SuperLATCH system makes installation easy.

The RadianRXT is NCAP crash tested, the industry benchmark for verifying child seat performance in severe accident conditions, and the only car seat rated for LATCH use with a child up to 80 lbs. The RadianRXT sits low on a vehicle seat for easy child boarding, features memory foam padding and infant support pillows. Expandable sides and a longer seat bottom provide extra room and comfort for your growing child. One cup holder is included, with the option to add up to 4 cup holders. In addition to all this versatility, it folds flat for travel and storage, has a 10 year life and offers amazing safety, comfort and convenience your child won't outgrow.


  • The Diono RadianRXT is rear-facing: 5 - 45 lbs; Forward-facing: 20 - 80 lbs and up to 57 inches in a 5-point harness; Booster to 120 lbs
  • Steel alloy frame and aluminum reinforced sides; SafeStop energy absorbing harness; Adjustable head support, reinforced for complete side impact safety: Energy absorbing EPS foam panels on all sides
  • Rear-facing tether capability; LATCH installation up to 80 lb child; 5 shoulder and 3 buckle positions for custom fit; Expandable sides and longer seat bottom for leg support and comfort
  • 2 recline positions in forward-facing mode; Sits low on vehicle seat for easy child boarding; Fits 3 across in a mid-size vehicle and offers more shoulder space
  • Folds flat for travel and storage

Additional Info





5 lbs

120 lbs


Adjustable Head Support,Cup Holder(s)



31.4 pounds

20.7 x 18.2 x 12.8

How to Get It

  • This item can be shipped to all 50 United States including Alaska & Hawaii
  • This item is NOT eligible for shipping to APO/FPO addresses, U.S. Territories, Puerto Rico or P.O. Boxes
  • Due to shipping restrictions, Ship Charges will be separate from other items in your order
  • This item may ship by itself

  • This item ships via Standard Shipping only

(learn more):

  • This item is sold in our stores
  • Orders placed for Store Pickup will receive online pricing and promotions
  • In-stock status is approximate and may not reflect recent sales
  • Not all items are carried at all stores. Please click the "Select a store" link to check product availability

Average Customer Rating:

by PowerReviews
Diono Radian RXT Convertible Car Seat - Spring

(based on 273 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.


  • Safe (9)
  • Comfortable (8)
  • Durable (8)
  • Easy to adjust (8)
  • Stylish (7)


  • Heavy (7)

Best Uses

  • Infants (9)
  • Toddler (9)
  • Newborn (6)
    • Reviewer Profile:
    • First time parent (4), Parent of two or more children (4)

Most Helpful Positive Review


Heavy but worth it

First thing is that this is heavy! When ups dropped it off and I tried to take it inside i realized that this is not a seat you want to move around alot. We...Read complete review

First thing is that this is heavy! When ups dropped it off and I tried to take it inside i realized that this is not a seat you want to move around alot. We don't so I wasn't too worried about that. As we got it unwrapped and set up I saw there was an added brace for rear facing position. I used it in the house just to keep this from falling over. I was getting aquainted with the straps and features as I had never seen one in person. We have Br!tax seats and have always used them but had a problem with the front!er as the cover comes undone all the time and rolls up under the kids rear. I was really impressed with how sturdy the latch clips were. I was expecting something like what we had previous but I have to say those folks at Diono have won that honor. The release mechanism is smooth and the operation is somewhat reverse of the other brand, I find that I much prefer it. The belts feel very durable and the cover is soft and supple. The 'baby' (3.5 YO) loved the flower print and was watching tv in it like a little recliner. The head adjustment is strange as you just manually lift it or push it down, no lever like the Br!tax. Not sure how I feel about this yet but it hasnt hindered the use or safety. I love the fact that we have some beefy steel to protect these guys. Like a tiny roll cage for precious cargo. The side wings are large but no more than she was used to but this seat does seem to cradle her better so that when she sleeps her head isnt bobbing and making mom nervous. She looks perfectly supported and downright comfortable. There is a slight recline which I think makes the difference as well. The cupholder is nice in that it can be moved, removed, added to, and run through the dishwasher when needed. Pretty hard to do when they are a built in feature. Also, the bottom hip wings can be adjusted to be verticle, for smaller ones, or more oblique, for larger kids, which makes it versitile and gives our kid something fun to play with as we drive. Pop! Pop! Pop! does it get any better?
Overall, she loves the seat. Its more big kid looking without sacrificing any safety, which we love. It was easy to install securely, fits like a dream, isnt gigantic, and will give her 5 point protection until she reaches the weight limit. We both HIGHLY recommend this seat, especially if you have a very wee one as it will be the only seat you will ever need or want.


Most Helpful Critical Review


Nice Seat, but far from perfect!

My wife and I bought 2 Diono car seats, a Radian RXT and a Radian R120. While I agree with most folks about the quality and such of these Dionos, I find it...Read complete review

My wife and I bought 2 Diono car seats, a Radian RXT and a Radian R120. While I agree with most folks about the quality and such of these Dionos, I find it very, very difficult, if not impossible, to install the seat properly. As we all know, the seat must be secured to the vehicles seat suck that there is less then 1" of movement in any direction. The design of the Diono prevents this. In the forward facing position in harness mode, the location of the belt path is so far rearward (due to the very slim nature of the car seat) that the angle of the belt is almost vertical. Without any horizontal component of the belt angle, there is no rearward force when the belt is tight. Hence, the seat can be pulled forward quite easily. And, the same things happens using the Latch system. Now, I except folks to tell me that if the belt is tight enough, the seat is secure. But all that is happening is the car seat is being sucked into the bottom cushion of the vehicles seat. In a collision, the car seat will flip out of the indent in the seat cushion. Now, if the car seat is reclined and some kind of "spacer" is used between it and the vehicles seat back, some amount of belt angle can be achieved and some amount of security realized. But really, that's what I have to so with the most expensive, supposedly best car seat on the market? And the worst part about doing that is the the whole reason to get ripped off paying such a premium for a car seat is to get an ultra compact seat that will fit in smaller spaces and blah blah. Once the bottom is kicked out forward, a whole bunch of room is lost and the kids legs are jammed up to the seat in front, just like the so-called "big and bulky" car seats. I know, I've had seats from brand X and while they may be more bulky, I never had this issue (in the same vehicle, by the way). To say I'm disappointed is an understatement. Frustrated and ticked off would be more accurate. Because, I don't have enough to do in my life then spend umpteen hours fooling around trying to get a car seat safely installed. Ridiculous. Good luck to you all!

Reviewed by 273 customers

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(2 of 2 customers found this review helpful)


Great Car Seat!!

By julieR

from Vienna, VA, United States

Comments about Diono Radian RXT Convertible Car Seat - Spring:

This is the 3rd Diono RXT that I own. I have three granddaughters ages 20 months to 5 1/2 and this car seat is perfect for them, and will last them until they are no longer in need of seats. I particularly like that with my arthritic fingers, I can get them into and out of the belts and buckles without too much difficulty! Love them!

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(1 of 1 customers found this review helpful)


Great car seat!

By E234

from Undisclosed

Comments about Diono Radian RXT Convertible Car Seat - Spring:

I bought this about a month ago and I love it! We have a smaller car and it fits great Facing backwards! There is plenty of room on the passenger side for a passenger in the front seat. The seat looks intimidating to install but once you do it one time it's easy. This car seat is a great size width wise too and doesn't take up an obscene amout of space in the backseat. It's a very sturdy car seat as well and I am very happy with our purchase.

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Great seat, great colors!

By Kaelo

from Undisclosed

Comments about Diono Radian RXT Convertible Car Seat - Spring:

Plum is my favorite color; portability and compactness are all pluses!

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(1 of 1 customers found this review helpful)


Love Love Love

By plagD

from Undisclosed

Comments about Diono Radian RXT Convertible Car Seat - Spring:

I have had this seat for about 16 months. I bought to rear face my son longer and we have loved this seat. The low sides have been amazing for loading and unloading whether I do it or he does. I moved him to a combination seat for his 4th birthday and bought a plum cover for my two year old. She has always enjoyed it herself. She usually rides in a Guide 65 or a Nextfit and would always smile and laugh when I put her in her brother's seat (my kids have almost the same seated height which helps). I love the RXT and my kids have never experienced head drooping even though we use it with the angle adjuster (absolute must if child meets necessary criteria... major space savor) because they rest their heads on the wings. Of course it is heavy. It's a high end seat which all seats that are, are about the same weight. The big harness pads are little odd to work with but I have learned a lot about the little quirks this seat has from the Facebook group Car Seats For The Littles. This seat is very low profile so I had a few issues when first installing with a seatbelt in my Equinox since it has long belt stalks but a few twists of the female end of the belt solved my issue. I have 9 car seats and have owned more all of different brands whether they be cheap or higher end brand seats (Safety 1st, Evenflo, Britax, Chicco and Combi) and this has been my favorite.

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Wonderful seat

By FrozenMom

from Arkansas, United States

Comments about Diono Radian RXT Convertible Car Seat - Spring:

I originally bought a RXT to keep my 16 month old daughter rear facing for longer than her britax would allow. I love the way Diono makes their seats! It is heavy and solid and feels like your child is very protected. My 2.5 year old niece was in a graco the felt flimsy after installing and I could move the sides of the seat in with my hands. It was in no way the same caliber as the rxt. My niece cried and begged to use the "cool and pretty" seat. So I bought a Rainier for my daughter and now both my daughter and niece are rear facing in Dionos. I am so happy with both car seats, wish I would have gotten these before buying any other.

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great overall!

By Anonymous

from Oklahoma City, OK, United States

Comments about Diono Radian RXT Convertible Car Seat - Spring:

The seat its self is very heavy. The seat is very open. It is also very safe. My daughter loves the seat too.

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great slim profile

By babyphat013

from Fredericksburg, VA, United States

Comments about Diono Radian RXT Convertible Car Seat - Spring:

We bought this with 3rd child on the way. After trying multiple carseats this was the only one to fit with our other 2 car seats, one infant Chico, and other convertible evenflo. Very good quality, easy for my 3 year old to get in and out of. Only con is its heavy and takes up lots of driver side space if using it rear facing.

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Works great. My child is ...

By sem17

from Ft Lauderdale, FL, United States

Comments about Diono Radian RXT Convertible Car Seat - Spring:

Works great. My child is comfortable as she has already taken a handful of naps in the car since installing it. Only thing if the seat is intended to use the foam block/ adjuster it should probably come with one. However I have read that people end up ordering more after only a few months as it will flatten and so I ended up using a sturdy cotton rug folded to give the same affect to lift the seat up & so far its doing the trick. Either way I would buy this seat again for my next child.

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Cool Colors

By bordenja

from Undisclosed

Comments about Diono Radian RXT Convertible Car Seat - Spring:

Storm and Plum are my favorite colors, but they are all good choices.

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(1 of 1 customers found this review helpful)


we LOVE our radian!

By carmynspring

from Ely, NV, United States

Comments about Diono Radian RXT Convertible Car Seat - Spring:

We've had our radian rxt for about a year now and my toddler has no complaints. Its got great rearfacing limits and its so compact with the angle adjuster. I called customer service to get different straps and they were amazingly helpful.

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