Diono Radian® 3QX Latch Ultimate All-in-One Convertible Car Seat

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radian® 3QX 2020

From baby's first journey the radian® 3QX provides complete protection, with Safe+™ newborn travel high wedge, Safe+™ 2-in-1 infant positioning liner and Safe+™ Anti-slip harness pads for added comfort and safety.

As your child grows the Safe+™ steel anti-rebound bar 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).

Engineered following the latest European research and technology in crash energy management, the radian® 3QX features 6 layers of side impact protection. Interlocking EPS and EPP foam, high density plastic and steel reinforcement combine to create ultimate side impact protection, without compromising 3 across fit in most midsize vehicles.

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.

All of these great features have been combined with Safe+™ engineering, with the 3QX subjected to a combination of the most rigorous crash tests; including side impacts and rollover test to ensure the safest seat possible.

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. 

3 Stage Rear-Facing Protection

Features Safe+™ newborn travel high wedge, Safe+™ 2-in-1 infant positioning liner and Safe+™ steel anti-rebound bar for complete rear-facing protection.

Safe+™ Engineering

radian® 3QX is subjected to a combination of the most rigorous crash tests to make sure to have the safest seat possible.

10 Years One Car Seat

With 4 ways to travel from birth to booster, the radian® 3QX adapts as your child grows to offer a custom fit from birth to 120 lb.

Rear Facing 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 Diono's famous radian® slim fit design, to fit 3 across in most vehicles without compromising child or passenger comfort.


    • Suitable up to 120 lb: The 2020 radian® 3QX is suitable from birth up to 120 lb in high back booster mode. 
    • Safe+™ steel core: All new upgraded steel core. Made from automotive grade high strength steel to shield and protect.
    • 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+™ 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 your toddler grows.
    • 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.
    • Easy remove covers: Radian 3QX features easy to remove covers. So when the next journey gets messy, easily remove to machine wash
    • SuperLATCH™ installation: SuperLATCH™ system makes installation easy and super secure. An audible click lets you know when connectors are locked in and safe.
    • Anti-slip XL harness pads: The radian® 3QX features all new XL hardness pads with anti-slip backing for extra comfort and safety.
    • Memory foam comfort: The radian® 3QX features memory foam padding in the seat base for optimum child comfort.
    • Cup Holder included:  Steel reinforced cup holder for drinks & snacks.
    • Travel ready: Radian car seats are super portable and fold flat for easy travel. They are also FAA Approved and certified for use on aircraft!
    • 10 year life from the date of purchase


    • Usage:
      • Rear-facing: 4 - 50 lbs
      • Forward-facing: 22 - 65 lbs in a 5-point harness
      • Booster: 40 -120 lbs (and up to 57")
    • Weight: 25.8 lbs


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