Diono Radian R120 Convertible Car Seat Plus Booster, Shadow

Diono Radian R120 Convertible Car Seat Plus Booster, Shadow

The Radian R120 is a highly versatile car seat that is 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 a 5-point harness, and then converts to a booster for children up to 120 lbs. Built for strength and safety, the Radian R120 has a steel alloy frame, reinforced sidewalls, Safe stop(R) energy-absorbing harness, thick EPS foam panels for side impact protection and Diono’s unique Super Latch system for easy installation. The Radian R120 is NCAP crash tested, at forces nearly double standard testing. Expandable sides and a longer seat with memory foam offer superior comfort for the child. Folds flat for travel and storage. The best package of safety, comfort and convenience available.

Main features

  • Plastic, Steel, Nylon
  • Imported
  • The Diono Radian family of car seats are the only convertible+booster seats with a full steel frame making them one of the safest car seats available today
  • Rear facing 5 to 45 pounds. Forward facing 20-80 pounds (up to 57″) in 5 point harness. Booster to 120 pounds
  • Infant body support cushions and memory foam for added comfort
  • Aluminum reinforced sides and energy-absorbing harness system for added safety
  • EPS foam for side impact protection
  • Folds flat for travel and fits 3 across in mid-size vehicle

Verified reviews


Does the job but not great.

I bought this car seat because I was having twins and also had a toddler and needed to fit 3 car seats across the back of our Ford Escape. I have this seat in between my two infant seats. I am not a fan of it. I don’t feel like it’s as comfortable as the seat she had before (Graco Myride 65). It is also more difficult to install. The part that buckles into the crotch strap gets stuck and I have broken a nail several times trying to wiggle it out. The only thing I like about it is that it enabled me to fit 3 seats across. Hopefully we’ll decide to buy a new car by the time my twins grow out of their infant carriers.

Antonia Suburb Maryland Fac, MD

best car seat on the market

Yes this car seat is heavy but the frame is steel so of course it’s going to be heavy. We chose this car seat after a firefighter friend of mine recommended the Diono brand as being one of the top safety rated car seats on the market. I wanted a car seat which would allow rear-facing for the maximum amount of time and this one goes to 45 pounds which is awesome. My little guy is a really long baby so the high back on this seat is perfect for him. I’d recommend this seat to anyone who is safety conscious and doesn’t mind spending a little extra for the best.

Elva Holbrook, AZ

fits just right

while we had a hard time installing (we are use to britax), now that we know how to do it it is cake! there is a video online that helped. i love this seat, and so does my son. he loves to flop his legs around and over the edges like he can’t do in his britax, but it isn’t as cozy for him to nap in since it doesn’t have the headwings. we put him in this seat forward facing at age 2.5 so i don’t have any experience rear facing or with a small child. we haven’t traveled with this either but the folding option is nice. we probably won’t take it since we just take our spare britax and check it under the plane. but the buckle is significantly easiser than the britax (not that this is a show stopper) and the straps get less tangled. i hate that you have to take it out to move up the straps, but honestly who cares, that is only once or twice a year anyways. the cup holder is nice and easy to remove any time and wash.

Leonor Tampa, KS

Makes it possible to leave my house!

This seat is fantastic! Besides all the amazing qualities that all the other reviews mention, this seat made travelling go from a nightmare to a joy. My baby HATED his car seat by the age of 3 months and would scream and strain against the straps. Since his carseat was so reclined, this Diono makes a world of difference for him. He can sit much more upright and it doesnt have those big "blinders"like other seats have so he can see out the window, which he had been struggling to do all along. It still has safety side impact protection but they are much less view-blocking. We love it and I’m finally able to leave the house without us both crying the whole time!

Whitney Morrisdale, PA

Great, narrow car seat

We got this seat for our youngest to graduate into from his infant carrier. I love the steel frame, although that does make it heavy. It folds closed for storage, which is great. All the straps and covers are a bit elaborate but definitely workable, and it helps make the cover more removable for cleaning. We have not had it in a crash, so I can’t speak to that aspect. Baby seems comfortable in it, currently weight 22 pounds and 32 inches long, rear facing. It fastens easily and keeps baby very secure. Love it. Considering buying another one for the other car…

Coleen Saint George, ME