Diono Radian 3QXT Convertible Car Seat Gray Slate

radian® 3QXT. The ultimate 3 across All-in-One car seat from birth to booster (4 – 120 lb / 1.8 – 54 kg). Featuring 4 stages of complete newborn protection and all new Diono Safe+™ engineering to provide the next generation in car seat safety.

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.

Safe+™ newborn protection insert:
Made from energy absorbing materials to support and protect. Super soft padding for extra newborn comfort. Simply remove as baby grows.

Safe+™ newborn travel high wedge:
Creates near lie-flat travel position for newborns while reducing head slump and helping to keep airways open. Simply remove as baby grows.

Safe+™ 2-in-1 infant positioning liner:
Gives extra infant comfort and toddler body support. Simply remove as baby grows.

Safe+™ newborn harness pads:
Small newborn harness pads for added safety and comfort.

Safe+™ steel anti-rebound bar:
One click connection to the seat base. Reduces rebound rotation by 50% in the event of a collision. Also provides more legroom when rear-facing.

Safe+™ steel core:
All new upgraded steel core. Made from automotive grade high strength steel to shield and protect.

Safe+™ headrest:
Engineered with the latest European Side Impact technology to improve child head containment in the event of a collision. Headrest height is increased by 22% from radian R series

Safe+™ side Impact protection:
Featuring 6 layers of interlocking EPS & EPP foam, high density plastic and steel reinforcement to create ultimate side impact protection without compromising 3 across fit.

Product Specs:
  • Rear-facing: 4-50 lbs / 1.8-22.7 kg
  • Forward-facing: 22-65 lbs / 10-29.5 kg
  • Booster mode: 40-120 lbs / 18-54 kg
  • Seated torso height: 7.5-16.5″ / 19-42 cm
  • Overall maximum height: up to 57″ / 144.8 cm
  • Weight: 25.8 lbs / 11.7 kg


Unfortunately, due to the nature of this item, we cannot accept any returns, click here for more information.
This product is excluded from any special promotions or coupons.
We are only able to ship this item to Canadian customers.
This product cannot be shipped to Remote locations.
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