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Diono RadianRXT Convertible Car Seat

Item # HN-SSK021

Dimensions & Specifications

Recommended Ages
0 yrs.
27.45 lbs.
Weight Capacity
120 lbs.


Machine wash and dry

Product Guarantee

Manufacturer Warranty

Return & Exchange Policy

  • Rear- or front-facing car
  • Memory foam padding for superior comfort
  • Folds flat for easier travel and storage
  • Reinforced adjustable head support
Full Description
Guarantee & Returns
Customer Reviews


by PowerReviews
Diono RadianRXT Convertible Car Seat

(based on 188 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.


  • Comfortable (4)
  • Durable (4)
  • Safe (4)
  • Stylish (4)
  • Easy to install (3)


    Best Uses

    • Toddler (4)
      • Reviewer Profile:
      • Parent of two or more children (3)

    Most Liked Positive Review


    Definitely the best car seat on the market!

    We've had out Radian for a little over a year now. Bought it when my daughter was 10 months old. Reviews from friends were awesome. Said this is the way to go. My...Read complete review

    We've had out Radian for a little over a year now. Bought it when my daughter was 10 months old. Reviews from friends were awesome. Said this is the way to go. My other daughter has a Recaro. and this by far surpasses the Recaro!! the extended rear facing and the angle adjuster option are a huge plus. Also, the size is wonderful. They are so slim, which makes them way less bulky in my opinion. we'd buy another in a heart beat. Diono also has awesome customer service! Looking for a car seat from birth to booster. Never having to buy another? This is the one for you!


    Most Liked Negative Review


    Disappointed and not impressed...

    I had to do my research on the best carseat for our family since I have a smaller car ('05 Toyota Corolla)--and realized that I may have an issue with giving the...Read complete review

    I had to do my research on the best carseat for our family since I have a smaller car ('05 Toyota Corolla)--and realized that I may have an issue with giving the front passenger enough leg room for them to be somewhat comfortable. After thorough research for the best type of carseats for compact cars, it came down to the Diono Radian RXT and a competitor brand. While I wasn't keen on the price (paid over $550 for two for our two vehicles), I felt that it was the right fit for our family based on the exceptional reviews I had read about, espeically for the safety reasons. My gripe with this carseat is that once my son is in it (currently it is rear facing) and I pull up on the strap to tighten him in, the straps NEVER get tight enough. At first I thought that maybe it was the way I installed it, so I uninstalled it, checked the straps and reinstalled it. Again, I have to pull so hard on the strap that I can literally make my car rock back and forth! I thought maybe it was just the angle that it happened to be in while in my car, but when I tried the strap on the seat in my husband's car (Mercury Mariner), it was even worse! You can barely pull up on the strap--it's almost like something is getting caught and won't let you pull up on it, but there's nothing in the way, so I don't know why it's so hard. To "fix" this, I have to pull on the (exposed) straps in the back to get the slack tightened and then at the same time, pull up on the strap to get rid of the slack. I cringe everytime I put my son in it and wish that I had never bought them. Another reason why I bought them was because it was rated to 120 pounds and that it would have to be the only car seat I buy. Instead of thinking that this is the only car seat I'll have to buy, I'm debating if I should purchase new ones--and who has the money to do that all over again...To make matters worse, we moved at the same time and of course threw out the boxes, so returning them wasn't an option. Overall, I was very excited to get them, but disappointed once they were installed.

    Reviewed by 188 customers

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    Harnesses tall, older kids

    By ALB9

    from Rhode Island

    Comments about Diono RadianRXT Convertible Car Seat:

    I've had this seat for over a year. My 7 year old is tall (49 inches), but doesn't weigh enough for just a booster/seatbelt to keep her safe in a crash (she's just barely 40 pounds). I wanted to find a seat where we could still keep her in a 5-point harness. We have owned eight different seats for our two kids and this one, by far, is my favorite. I believe Diono has created close to *the* most perfect seat on the market. Pros: 1) Literally the only seat you'd need to buy to last your son or daughter's entire childhood. Rear-faces for newborns, all the way up to 45 lbs. Forward-faces with 5-point harness up to 80 lbs (my 7 year old is 49 inches tall and is still wearing the 5-point harness - she cannot do this in any other seat, even seats that boast extended harnessing). Converts to a booster up to 120 lbs. 2) Has a ten-year life, compared to 4-6 years for most other seats 3) Durable and safe with an easily-adjustable headrest and side-impact protection. I feel like my kid is in a tank when she's sitting in this 4) Folds for travel 5) Airline approved (not all seats are!) 6) Narrow enough to fit three across the backseat of a sedan - which is a huge consideration if you don't have a minivan or a 3rd row in your vehicle but you have 2 or more kids. Cons: 1) It's pricey (shop around, prices vary widely) 2) It's HEAVY (but that goes along with its safety and durability, so it's a trade-off) 3) It's not the easiest to install. I don't like the LATCH clips; I prefer the style of LATCH that other companies like Britax use, where you can adjust from both sides. This one only has the adjuster on one side. I don't feel like I can get as tight a fit as I can with other seats. It is also difficult to install using the seatbelt. I have very small hands, but I have such a hard time sticking my hands back there to thread the seatbelt through. 4) The adjustable headrest is a little *too* easy to adjust. It tends to slide down on my daughter with normal use (this could be a defect in my particular seat, though). Not enough of a nuisance to dissuade you from buying, though. 5). To adjust the height of the shoulder straps, you have to uninstall the seat, partially take off the cover, un-hook the straps from behind the seat, un-thread them from their current setting, and re-thread them back through the slots at the desired height. This is a big inconvenience to me because a lot of other comparable seats on the market have figured out how to adjust the height with the turn of a knob, and you don't have to un-install the seat. Come on Diono, you can do this. If you figure this out, you will have created the perfect seat. 6). My daughter complains that there is not enough padding on the seat part of the seat. I agree that it is minimal padding. On long trips, she complains about how uncomfortable she is, and she is a great traveler who rarely complains. She cannot be the only one. Overall, the pros outweigh the cons, and I wholeheartedly recommend this incredibly safe and versatile seat. It is expensive, but worth its weight in gold.


    The Perfect Carseat

    By jess88

    from Montana

    Comments about Diono RadianRXT Convertible Car Seat:

    This is the best carseat we have had. Very comfortable, easy to clean, even stylish!


    Best Seat for Moms of Multiple Children

    By AEJONES987

    from Orlando, FL, United States

    Comments about Diono RadianRXT Convertible Car Seat:

    I own three Diono Radian RXT carseats. I have a 2 year old, 4 year old and 5 year old. They really do fit three across! I have been able to do it in my JEEP Liberty, GMC Terrain, and my Chrysler Town and Country. They are the best!



    By originalpandora

    from Beaufort, SC, United States

    Comments about Diono RadianRXT Convertible Car Seat:

    My LO is so much happier in the car now. She loves the comfort and extra room!


    Great reviews!

    By Marisol02

    from Illinois, United States

    Comments about Diono RadianRXT Convertible Car Seat:

    I have a group of moms, and many of them have this car seat and have recommended it to me. I have been looking for rear facing car seats for a while now, and this one looks comfortable!

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