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Diono Radian® 3QXT+ All-in-One Convertible Car Seat

Diono Radian® 3QXT+ All-in-One Convertible Car Seat

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Product details
Official manufacturer description


Introducing the luxury 3 across All-in-One Car Seat for first class travel from birth to booster suitable from 4 - 120 lb / 1.8 - 54 kg. Diono Radian® 3QXT+ features Safe+® engineering, exclusive premium fashion and Safe+® 2-in-1 anti-rebound panel and adjustable calf support for the very best in safety, comfort and style.


  • LUXURY TRAVEL FROM BIRTH TO BOOSTER - From rear-facing to forward facing Radian® 3QXT+ adapts as your child grows for 10 years of first-class travel from birth to booster. Suitable from 4 – 120 lb.
  • SAFE+® 2-IN-1 ANTI-REBOUND PANEL AND ADJUSTABLE CALF SUPPORT - 1. Anti-rebound panel increases stability when rear-facing and reduces rebound rotation by up to 50%. 2. Adjustable calf support and comfort liner provides additional comfort as they transition to forward-facing.
  • SAFE+® ENGINEERING - Features a unique combination of engineering features and testing to the highest safety standards to ensure the safest seat possible.
  • EXCLUSIVE PREMIUM FASHION - Designed with mesh panels and premium fabrics. Easy remove and machine washable for comfort, convenience and style All-in-One.
  • THE ORIGINAL RADIAN® 3 ACROSS: Built with our famous 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.

What's included

  • Two  XL Cup holders
  • Car Seat Protector
Product dimensions
16 in. D x 17 in. W x 28.5 in. H
Product weight
34.2 lbs
Age Range (Booster Mode)
From 4 to 12 years
Age Range (Forward facing)
From 2 to 4 years
Age Range (Rear Facing)
From infant to 2 years
Head rest positions
Installation Type
Rigid Latch System
Set Includes
Cup Holder
TSA Approved
Child Maximum Weight (Forward Facing)
65 lbs
Child Maximum Weight (Booster)
120 lbs
Child Maximum Weight (Rear Facing)
50 lbs
Child Minimum Weight (Rear Facing)
4 lbs
Child Minimum Weight (Booster)
40 lbs
Child Minimum Weight (Forward Facing)
22 lbs
Care instruction
Covers: Machine wash cold, line dry. Shell and Components: Spot clean
Folded dimensions
11.5 in. D x 17 in. W x 28.5 in. H
Height range
Up to 57.1 in.
Steel, Plastic, Aluminum, Textile
Weight Range
4 to 120 lbs
Diono Radian® 3QXT+ All-in-One Convertible Car Seat
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Top reviews
Would an expert recommend this for your baby?
Kristina Spencer
Kristina Spencer
Verified baby & toddler expert
Reviewed Aug 25, 2022

Fits children from 4 - 50 lbs and up to 44 in tall in rear facing, 22 - 65 lbs in forward facing, and from 40 - 120 lbs in high back booster and up to 57 in tall. Anti-rebound panel for rear facing and side impact protection. Adjustable head rest for as your child grows. Slim fitting with 2 removable cup holders and comes with a car seat protector for your car. Machine washable cover.

Mariah Wear
Mariah Wear
Verified baby & toddler expert
Reviewed Aug 25, 2022

22-65 pounds front facing (only up to 40 pounds with LATCH) then transition to the seat belt. 40-120 pounds for booster seat.