COMING SOON! Radian 3QXT+ FirstClass SafePlus All-in-One

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COMING SOON! The luxury 3 across All-in-One Car Seat for first-class travel from birth to booster. Featuring SafePlus™ engineering and exclusive premium fashion. The SafePlus™ 2-in-1 anti-rebound panel and adjustable calf support provide the very best in safety, comfort, and style.  Suitable from 4 – 120 lbs. COMING SOON!

  • 4 Stage Infant Protection
  • Slim Fit 3 Across
  • Safe Plus Engineering easy adjust 12-position headrest
  • 8 layers of SafePlus Side Impact Protection
  • Rollover and side impact tested
  • SuperLATCH connection for easy installation
  • Compact fold and FAA-approved for use on an aircraft
  • Removable cup holder

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The Luxury 3 Across All-in-One



Featuring the Radian® slim fit convertible design for a 3-across option only with Diono Radian® combinations without compromising child or passenger comfort. Feel safe having your children secure in the backseat

Complete Newborn Protection

Inlcudes SafePlus newborn insert, travel high wedge, positioning liner, and travel harness pads.

SafePlus Engineering

The SafePlus 2-in-1 Anti-rebound panel increases stability when rear-facing and reduces rebound rotation by up to 50%. The adjustable calf support provides additional comfort as your child transitions to forward facing.

FAA Travel Approved

The Radian 3QXT+ First Class SafePlus is engineered with a compact fold and is approved for FAA travel.

Comfort & Washable

Designed with mesh panels premium fabrics, and Comfort+ Memory Foam, the 3QXT+ FirstClass SafePlus cover is hard-wearing, easily removable, and machine washable.

Product Specs

Available Colors

Black Jet, Gray Slate

Product Weight 34.2 lbs
Product Dimensions 16 x 17 x 28.5 inches

Additional Info

Dimensions (Folded) 11.5 x 17 x 28.5 inches
Minimum User Weight - Rear Facing 4 lbs
Maximum User Weight - Rear Facing 50 lbs
Maximum User Weight - Rear Facing (LATCH0 35 lbs
Minimum User Weight - Forward Facing 22 lbs
Maximum User Weight - Forward Facing 65 lbs
Maximum User Weight - Forward Facing (LATCH) 40 lbs
Minimum User Weight - Booster 40 lbs
Maximum User Weight - Booster 120 lbs
Maximum User Height 57 inches
Head Support Positions 12
Cup Holder Yes
Use and Care ‎Covers: Machine wash cold and line dry. Shell and Components: Spot clean
Warranty 12 months standard warranty - extended to 36 months when you register with Diono® post purchase
  • What comes in the box?

    Radian® 3QXT® FirstClass™ SafePlus™ Car Seat, Instruction Manual, SafeStop and SafePlus™ Side Impact Management Pod, 2x Cup Holders, SafePlus™ 2-in-1 Anti-Rebound Calf Support, Harness Pads, Rear Facing Base, Toddler Liner, Lap Belt Cushion (US only).

  • SafePlus™ Newborn Protection Insert, SafePlus™ 2-in-1 Infant Positioning Liner, SafePlus™ Newborn Harness Pads, SafePlus™Newborn Travel High Wedge

  • On all Radian® models including R-series and Q-series, the harness should be placed at or just below the child’s shoulder when they are rear-facing. The harness should be snug. You should not be able to pinch the webbing at your child's shoulders.

  • Use of the harness pads are optional on seats made as of 2018 and forward. For seats made prior to 2018, their use is required when using the seat forward-facing, but still optional rear-facing.

  • 51 inches (129.5 cm) is the minimum vehicle seat width needed between door handles (or other vehicle interior structures) to fit 3 Radian® models.

  • The rear-facing base is included with all of our Radian® all-in-one convertible car seats.

  • A rear-facing child is too tall for the seat if any of the following are true: they are 44in or taller, there is 1 1/2in or less between the top of their head and the top of the seat shell.

  • When in forward-facing mode a child is too tall for the seat if they are 57in or taller, the tops of their ears are higher than the seat shell, or their shoulders are touching the bottom of the adjustable head support at its highest position.

  • No. Thick clothing creates extra space between the harness and the child which is a safety hazard. We recommend removing the coat and harnessing your child in their seat. Then you can place their coat on backwards or use a blanket to keep them warm.

  • Diono car seats and boosters are tested to meet or exceed Federal Motor Vehicle Safety Standards (FMVSS) per the NHTSA.