Diono Radian 3QXT Latch Convertible Car Seat 2020


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Diono 2020 Radian 3QXT Latch All-In-One Convertible Car Seat

The ultimate All-in-One car seat from birth to booster, the Radian 3QXT offers superior protection and comfort for your growing little one. Featuring 4 stages of complete newborn protection and all new Diono Safe+ engineering to provide the next generation in car seat safety.


Overall Age/Weight Range

Suitable from birth to 120 lbs/54kg

Rear Facing Convertible Weight


Forward Facing Convertible Weigh

22-65 lbs/10-29.4kg

Belt Positioning Booster Mode

40-120 lbs/18-54 kg

Overall maximum height


Product Weight

25.8 lb / 11.7 kg

From baby's first journey the radian 3QXT provides complete newborn protection, with Safe+ newborn travel high wedge, Safe+ newborn protection insert, Safe+ 2-in-1 infant positioning liner and Safe+™ newborn harness pads to provide a custom fit from birth.

As your child grows the Safe+ steel anti-rebound increases stability and reduces rebound rotation by up to 50%, so you can keep them safely rear facing for longer, up to 50 lb (approx. 4 years old).

As they transition to forward facing, the Safe+™ easy adjust 12 position headrest is contoured to improve child head containment and provides a 22% increase in occupancy range from the radian R series.

Parents can also expect the travel friendly traits Diono is famous for, including convenient fold and FAA approval for use on an aircraft. So, no matter where you go you can take Diono safety with you.


  • 4 STAGE COMPLETE NEWBORN PROTECTION - Features Safe+™ newborn travel high wedge, Safe+™ newborn protection insert, Safe+™ 2-in-1 infant positioning liner and Safe+™ newborn harness pads to provide a custom fit from birth.
  • DIONO SAFE+ ENGINEERING - radian® 3QXT is subjected to a combination of the most rigorous crash tests; front, rear, and side impacts, and rollover test to make sure we have the safest seat possible.
  • 10 YEARS 1 CAR SEAT - With 5 ways to travel from birth to booster, the radian® 3QXT adapts as your child grows to offer a custom fit from birth up to 120 lb.
  • REAR FACING FOR LONGER - Designed and engineered with all new Diono Safe+™ protection. Now you can keep your child rear facing for even longer up to 50 lb (approx. 4 years old).
  • SLIM-FIT DESIGN FITS 3 ACROSS - Built with our famous radian® slim fit design, to fit 3 across in most vehicles without compromising child or passenger comfort.
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