Search  for anything...
Diono

Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear Facing & Forward Facing, 10 Years 1 Car Seat, Slim Fit 3 Across, Jet Black

  • Based on 6,947 reviews
Condition: New
Checking for the best price...
$199.99 Why this price?
Save $95.00 was $294.99

Buy Now, Pay Later

As low as $33.33 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

90-day refund / replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 1 left in stock, order soon!
Fulfilled by Amazon
Arrives Wednesday, Sep 17
Order within 23 hours and 17 minutes
Available payment plans shown during checkout

Recently Viewed

Style: Radian 3R Fits 3 Across


Color: Black Jet


Features

  • 10 Years One Car Seat - from Birth to Booster (5 - 120 lb) it's all you will need. Grows with your child, ultimate protection on every road trip. 4 modes in 1 seat!
  • Rear Facing for Longer - lovingly engineered to keep your child rear-facing up to 50 lb.
  • Fits 3-Across - our famous slim-fit design with zero compromises to safety, space, or comfort.
  • Mechanically engineered from reinforced automotive grade high-strength steel, our unique core shell shields and protects your child.
  • High-quality ComfortPlus Memory Foam, always included.
  • The original and only all-in-one convertible car seat that folds for travel or compact storage. FAA approved for airline use.

Description

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.

Brand: Diono


Installation Type: Latch


Material: Alloy Steel, Plastic, Polypropylene, Polystyrene


Color: Black Jet


Orientation: Convertible Seat


Product Dimensions: ‎16.1 x 16.9 x 28.4 inches


Item model number: ‎50620


Is Discontinued By Manufacturer: ‎No


Minimum weight recommendation: ‎5 Pounds


Maximum weight recommendation: ‎120 Pounds


Minimum height recommendation: ‎18.1 Inches


Maximum height recommendation: ‎57 Inches


Material Type: ‎Alloy Steel, Plastic, Polypropylene, Polystyrene


Material Composition: ‎90% Polyester, 10% Spandex


Care instructions: ‎Covers Machine wash cold, line dry. Shell and Components Spot clean


Additional product features: ‎Fits 3 Across


Number Of Items: ‎1


Style: ‎Radian 3R Fits 3 Across


Number of reclining positions: ‎1


Batteries required: ‎No


Orientation: ‎Convertible Seat


Rear-facing minimum child weight: ‎5 Pounds


Rear-facing maximum child weight: ‎50 Pounds


Forward-facing minimum child weight: ‎22 Pounds


Forward-facing maximum child weight: ‎120 Pounds


Harness type: ‎5-Point


Item Weight: ‎23 pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Sep 17

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Great car seat
Style: Radian 3R Fits 3 Across Color: Red Cherry
This car seat is worth the money. It will grow with our son and fits any car or off road vehicle. I bought it especially to fit the backseat of our sxs. Due to how narrow it was, it required a special car seat. The stability and comfort were great for our toddler. The latch system was easy to install but strong and sturdy. Would definitely buy this again. ... show more
Reviewed in the United States on August 19, 2025 by Brooke Hays
    • Diono Radian 3R - A Game-Changer in Car Seat Comfort and Safety!
Style: Radian 3R Fits 3 Across Color: Red Cherry
The Diono Radian 3R 3-in-1 Convertible Car Seat has proven to be an absolute game-changer for our family, and my son absolutely loves it! The versatility of this car seat is outstanding – from rear-facing to forward-facing, it's designed to accommodate different stages of a child's growth. The 10-year lifespan is a fantastic feature, providing peace of mind knowing that it will last through various developmental milestones. My son finds the seat incredibly comfortable, and the plush padding adds an extra layer of coziness. The reinforced steel frame gives a sense of security, and the installation process was surprisingly straightforward, thanks to the clear instructions provided. What sets the Diono Radian 3R apart is its slim design, making it a perfect fit even in compact cars without compromising safety. The adjustable headrest and harness system ensure a snug and secure fit as my son continues to grow. As a parent, I appreciate the ease of cleaning – the fabric is removable and machine washable, a lifesaver for those inevitable spills and messes. If you're in search of a convertible car seat that prioritizes both comfort and safety, the Diono Radian 3R is an excellent choice. It has made our car journeys much more enjoyable for my son, and as a parent, I couldn't be happier with this purchase! 🚗👶🌟 #DionoRadian3R #ConvertibleCarSeat #SafetyFirst ... show more
Reviewed in the United States on January 23, 2024 by Dana Cecil
    • Great size. Great seat
Style: Radian 3R Fits 3 Across Color: Red Cherry
I love how easily you can move the seat. Its also very easy to clean. Its also perfect size, i dont have much room in the back of my car and this seat doesnt take up much room at all. It does all that while still keeping my mind at ease knowing my child is safe and comfortable.
Reviewed in the United States on August 22, 2025 by Esmeralda Cervantes
    • Perfect for multiple kids in a smaller vehicle
Style: Radian 3R Fits 3 Across Color: Black Jet
Easy to install, fits 3 across in our mid-size suv, very comfortable for long rides for our kids, a little on the heavy side but that comes with a durable car seat. Colors are what we ordered. Easy to clean. Easy to adjust straps.
Reviewed in the United States on May 26, 2025 by Mason
    • Fits 2 in a row with additional infant seat in Toyota Camry!
Style: Radian 3R Fits 3 Across Color: Black Jet
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! ... show more
Reviewed in the United States on February 12, 2025 by Esther
    • Make sure that you have a vehicle that has all safety hooks for rear and front face use
Style: Radian 3R Fits 3 Across Color: Black Jet
The car seat is nice however with certain vehicles using the top tether hook for safety is not an option while using in rear facing. No instructions came in the box so I had to google the manual. According to the manual the top tether safety latch is supposed to be used when in rear facing. It is rather big still for my back seat even though it is a slim fit. Not much when adjusting it is pretty basic. I have not cleaned it yet since I just got it yesterday. My baby seems to be comfortable to n it but when he falls asleep I worry with the way his head slumps over. ... show more
Reviewed in the United States on June 27, 2025 by Naomi Flores
    • Safe, affordable, & comfort all in one!!!
Style: Radian 3R SafePlus Fits 3 Across Color: Black Jet
Review Image by Darlene Darlene
Great car seat! It’s sturdy & very sheik I love the easy cleaning fabric it has, it is very heavy which makes me feel like my baby is safe in it! It’s got adjustable shoulder straps & head rest adjustments as well so it can grow with your baby. The seat part also has side adjustments so it can be narrow or wider which is a neat feature! I won’t be using it for travel but it folds up and could be easy to transport if you can carry the heavy weight of it. For the price of this car seat it was a steal!!! We spent double on a Gracie brand before and i feel this car seat is much safer, it’s also roll over tested which is great because not many car seats have that. I will say the cup holders are terrible they fall out very easily but I rather my kid be safe than have a cup holder!!! I was able to fit 2 of these car seats in with a Doona in my Ford Escape 2018 which was suppose to be impossible but the fact of how compact it is made it possible, my boys also say it’s very comfortable which is a huge bonus! Definitely a must buy car seat!!! ... show more
Reviewed in the United States on April 22, 2025 by Darlene Darlene
    • Very very sturdy and strong probably one of the best on the market
Love the seats after having a car accident we decided to go for a much stronger and sturdier seat and this came in at top of the list they fold nice and flat for traveling on planes and things but just be prepared they are very very very heavy so would be hard to carry around a airport with child in arms also a little hard to instal but well worth it in the end love all the cool colors u can also choose from ... show more
Reviewed in the United States on March 27, 2025 by olivia robert

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...