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Your cart is empty.The Diono Radian 3R is the original slim-fit 3 across All-in-One convertible car seat, designed to protect from baby to booster seat (5 - 120 lb). Lovingly engineered with the famous Diono steel reinforced frame and now rear facing for even longer, expect 10 years of safety from just one car seat. Designed and engineered with complete rear facing protection, so you can keep them in a safe rear facing convertible car seat for longer up to 50 lb. Built with a mechanically engineered, reinforced steel frame, made from automotive grade high strength steel, the radian is always ready to shield and protect. And when your family grows, the slim-fit design will fit 3 across in most vehicles without compromising child safety or passenger comfort. Our SuperLATCH system (UAS Compatible) makes installation easy and super secure. As travel car seat experts, Diono have naturally built in super portable and convenient features to the Radian 3R with original fold for easy transport and storage and easy remove machine washable covers. The radian is also aircraft certified (FAA approved), so you can take safety with you wherever you go.
Esther
August 24, 2025
We bought 2 of these to fit in the backseat of our 2010 Toyota Camry. 1 rear facing, middle forward facing, next to infant (Uppababy Mesa) seat. Middle forward facing was the only way it would fit. Pro’s: slim, sturdy, easy for our kids to get into themselves, latch system is easy/works well. Good customer service from Diono. Our first one didn’t have the rear-facing piece in the box.Cons:* Very heavy!* Tall backside. Check your car seat manual whether a car seat is allowed to touch/rest against the front seat (if rear facing). Now having moved one to the middle back seat (forward facing) on our Honda Odyssey, it sits higher and blocks the rearview a bit. Wasn’t an issue in the Camry.No cupholders- fine, since that wouldn’t fit anyway.Not as much padding, so perhaps less comfortable, but both our kids are fine in them.Overal conclusion: great car seat if you have a tight back seat!
Jarett Sisk
July 11, 2025
We have two of these carseats now and absolutely love them. They are slim and provide a lot of room for both the child using the carseat and the person sitting next to the car seat. I love how these carseats feel open and not so enclosed for the child.The car seat itself is very easy to install correctly and the cover is easily removable and reattachable for easy cleaning. The padding is great and it feels really secure and has great stability. Overall great quality.The only thing I wish that was different, is i wish these came with at least one cup holder. These are the only carseats I love to use for forward facing kids!
SDigs
May 21, 2025
This is a very sturdy car seat. It is also the only car seat that I have seen that folds for storage. It is great for small children but large enough for older children. My 7 year old even fits comfortably. It is a great seat that will last many years!
M. Masters
May 17, 2025
We absolutely love our Diono Radian 3R! It's been a fantastic car seat for our child, lasting from infancy all the way to booster use. Here's why it gets 5 stars:Space-Saving Design: This car seat is a dream for tight spaces. Its slim design allows us to fit 3 car seats across our mid-size car, perfect for families with multiple children.Long-Lasting Value: This car seat truly grows with your child. It transitions seamlessly from rear-facing for newborns (up to 50 lbs) to forward-facing (up to 100 lbs) and then to a booster seat (up to 120 lbs). It's a one-time investment that lasts for years.Comfort & Safety: Our child finds the Radian 3R very comfortable, with breathable fabric and a well-padded design. Plus, Diono's safety record and features like the steel-reinforced frame give us peace of mind.Easy to Use: Installation with SuperLatch was a breeze, and switching between rear-facing and forward-facing is simple. The harness is easy to adjust and the removable cup holders are a convenient touch.Easy to Clean: The Diono Radian 3R's machine-washable fabrics make cleaning up spills and messes a breeze.If you're looking for a convertible car seat that's safe, space-saving, comfortable, and built to last, the Diono Radian 3R is an excellent choice!
Loren Ventura
May 6, 2025
My daughter is 42inches, 36lbs- 5 years old pictured here.We bought this car seat with the idea that i wanted a slim durable seat that my daughter could grow in to and have for a long period of time.Pros: • Narrow design, great for tight spaces • Comfortable without the need for extra padding • Minimalistic but feels very secure • Steel frame provides added safetyCons: • Quite heavy, not ideal for travel • Tall and wide when rear-facing, limits front seat adjustment (not pictured here) • Adjusting the shoulder height requires uninstalling the seat, which is inconvenient • Not versatile for use with multiple kids due to the need for frequent rethreading of the harnessOverall, it’s a solid choice for safety and comfort but better suited for a dedicated setup rather than frequent switching or travel.
Kylie
April 17, 2025
Love this brand of car seat. The safety aspect is why I went this brand, love that it’s narrow and you can fit 3 across. Cleaning this car seat is a breeze, the cover comes off for it to be washed. I have 2 of this exact one and then a high back booster of the same brand. Great quality car seats, easy to install, easy to clean. Highly recommend this brand to anyone with littles.
Vett Garcia
March 30, 2025
I switched from Graco to this one once my child moved to forward facing, but that wasn't my plan. I initially bought this as my airport/travel chair, but when it arrived and I felt how heavy it was, that was out but I decided to not return it and I'm so glad I didn't. My child is long and I felt she looked cramped in Graco. So when I changed her position, I took the Diono to the fire department to install (if you don't know, they do this for free) and they said that Diono was the creme de la creme, the best in safety. They said the weight adds value. They installed it SO TIGHT, that I feel soooo secure in the event of an accident that the baby will be alright. They said it's a bit difficult to install, but it was worth the work. It is the last seat I'll buy bc it lasts until 120lbs. It's slim in the car. I'm so pleased and the color is cute!!
Claudio Frederique
February 15, 2025
The Diono Radian 3R car seat is a fantastic investment! It offers exceptional safety, comfort, and longevity. With its versatile design and easy installation, it grows with your child. Plus, the removable covers make cleanup a breeze. Highly recommend!It is kinda heavy to lug around so it’s best to not move it much.
Customer
January 21, 2025
We bought these specifically for their narrow size for aeroplane travel with our kids (3, 5).They fold nicely and can sit on top of your luggage. We used a small crank tie to attach it to our carryon as it is awkward and a bit heavy to carry on a long walk through an airport terminal.But it fits nicely in aeroplane seats, they are very quick and easy to install in both cars and planes. The pull strap to secure your child is a lot easier to use than other car seats we have used.These are a bit pricey, but are absolutely worth the cost.
L. Toussaint
January 7, 2025
Ocupas ser un Ingeniero Aeronautico o automotriz para Instalarlo. Es demasiado Dificil su instalación. Pero brinda buena protección al BB
Salvador Rivera
January 4, 2025
Buena calidad, muy seguro y sencillo de instalar
Shaun
November 17, 2024
This seat is great. Very heavy but it's stable and fits perfectly in the car. Very happy it was only $200
Maria Kolerova
November 15, 2024
I have 3 of them! all fit in my car. I love how slim and comfy these are. Easy to install and clean.
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