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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 192 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 192 customers

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    Love it!

    By Aide06

    from Fort Irwin, CA, United States

    Comments about Diono RadianRXT Convertible Car Seat:

    We have had this seat for about a year! First in a small car and this seat gave us tons of space for others to sit in the back, even to install other seats next to him. We love how slender it is and how easy it is to install. Our son loves the low profile which allows him to see everything that is going on.

    (1 of 1 customers found this review helpful)


    This seat saved my son

    By jordonsmum

    from Victoria, BC, Canada

    Comments about Diono RadianRXT Convertible Car Seat:

    I own a daycare and purchased diono radian seats because of their crash ratings and because of their slender structure. It is easy to fit 3 across the back of almost any vehicle. We were sitting at a stop light on the highway this past weekend when a commercial van ploughed into the back end of my van. He was texting and driving and never applied the breaks. The doctor said my 8 yr old son must have been sitting in an amazing car seat because with the number of bruises he sustained, he should have sustained more serious injuries. Thank you Diono for keeping my son safe!!!!


    We were in a car accident and my son isn't injured

    By Dawn

    from Iowa

    Comments about Diono RadianRXT Convertible Car Seat:

    My son is 22 mo and approx 28 lbs. & still rear facing. We were in a car accident and waiting to here if my car is totalled. It was not drivable after the accident. My son didn't cry other than the initial scream of surprise when I hit a car in front of me. He isn't showing any signs of soreness or discomfort. I'm pleased. My only compliant is that this car seat is heavy and difficult to install but otherwise, so worth it.


    Love, Love, Love our car seat!!!

    By Heather88

    from North Dakota, United States

    Comments about Diono RadianRXT Convertible Car Seat:

    We have had our Diono RXT for 6+ months and love it! We drive long distances to visit our family and it made travel easy! Our daughter doesn't get crabby because she is so comfortable. It also adds a huge piece of mind as we live in the oil field with lots of heavy truck traffic.

    (2 of 2 customers found this review helpful)


    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.

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