ITEM# 51220

Diono Radian 3QXT Narrow All-in-One Convertible Car Seat - Black Jet

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Diono Radian 3QXT Narrow All-in-One Convertible Car Seat - Purple Plum
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Diono Radian 3QXT Narrow All-in-One Convertible Car Seat - Gray Slate
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Diono Ultra Mat Vehicle Seat Saver
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The most advanced diono Radian all-in-one convertible car seat that transforms as your child grows from baby to booster for 10 years one car seat (4 - 120 lb). Now upgraded with 25 improvements from the award-winning radian 3RXT ad featuring advanced 4-in-1 rear facing protection with SafePlus™ engineering to provide the next generation in convertible car seat safety. Radian 3QXT provides complete baby and infant protection, with SafePlus™ newborn baby travel high wedge, newborn baby protection insert, 2-in-1 infant positioning liner and newborn baby harness pads for a custom fit from 4 lb. As your child grows the SafePlus™ steel rear facing anti-rebound bar increases stability and reduces rebound rotation by up to 50%, so you can keep them in a safe rear facing convertible car seat for longer up to 50 lb. As both a rear and forward facing convertible car seat the Radian 3QXT protects as they grow, with the SafePlus™ easy adjust 12 position headrest that offers a 22% increase in occupancy range from the Radian series. With 8 layers of side impact protection, a side impact management pod, SuperLATCH connectors (UAS Compatible) and safe 5-point harness, the Radian 3QXT provides advanced safety from rear facing to forward facing harness booster to belt positioning booster modes.


  • 10 Years One Car Seat - from Birth to Booster (4 - 120 lb) it's all you will need. Grows with your child, ultimate protection on every road trip. 4 modes in 1 seat!
  • SafePlus™ Rear-Facing Engineering up to 50 lb. Includes 4 stages of newborn protection and our steel anti-rebound bar that reduces rebound rotation by up to 50% while increasing space for your growing child.
  • Fits 3-Across - our famous slim-fit design with SafePlus™ 8-layer side impact protection 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.
  • One hand easy-adjust 12 position SafePlus™ headrest completes 8-layers of enhanced, rigorously tested, side impact protection.
  • The original and only all-in-one convertible car seat that folds for travel or compact storage. FAA approved for airline use.


  • Dimensions (Overall): 28.5 inches (H) x 17 inches (W) x 16 inches (D)
  • Weight: 32 pounds
  • Features: Forward or Rear Facing Seat
  • Fits Child (Forward Facing): Height between 29.9 inches and 57.1 inches, Weight between 22 pounds and 120 pounds
  • Fits Child (Rear Facing): Height between 18.1 inches and 44.1 inches, Weight between 4 pounds and 50 pounds
  • Industry or Government Certifications: Meets Federal Motor Vehicle Safety Standards
Product Reviews
out of 5.0
5 Reviews
Ratings Snapshot
of Reviewers
McKinney, Texas
Verified Buyer
NUNA has much better offerings.
July 8, 2023
The steel bar that helps reduce rebound can be hard on kids' feet since there isn't padding for it. We have a NUNA RAVA and needed to get something to travel with for our second child. While I think this seat is better than most GRACO or other brands, it falls far short of the NUNA products in general. Especially in the comfort section for the child.
  • Folds nicely for travel. Steel frame. Narrow for 3 wide in some vehicles,
Best Uses
  • When space is limited, this may be a good option.
  • Very heavy due to the steel construction. The steel rebound bar may injure kids' feet if they are wearing shoes.
Woodbine, Georgia
Verified Buyer
Great Safety Features
September 6, 2021
best safety features available. awesome adjustability.
  • safety
  • adjustability
  • heavy
  • Large
Smyrna, GA
Verified Buyer
Husband loves it!
March 3, 2021
We were looking for a convertible for my husband’s Tacoma, and I came across this one because of its slimmer profile. He loves it! It was pretty easy to put together and install, and it’s honestly really nice!! It’s pretty heavy, but with the rebound bar and ability to convert to a booster, that’s understandable. Our 15-month old daughter loves her new ride as well!
  • Durable, high quality, can fit 3 across (not needed for us, but we needed the slimmer profile), sleek, converts to booster, rebound bar, folds up
Best Uses
  • For those wanting a slimmer profile or a really nice ?forever? car seat!
  • Heavy, a little deep, not able to recline unless you purchase the angle adjuster
South Carolina
Verified Buyer
June 16, 2020
Love this seat! Bought it for our baby due in sept and we took it out of the box and installed it. Super comfy and built super strong! I definitely feel comfortable putting my baby in this!
Hutchinson, ks
Verified Buyer
April 23, 2020
Came in a timely manner and was the correct color. We are excited to be able to use this.
Customer Q&A