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Diono Radian® 3RX All-in-One Convertible Car Seat

Diono Radian® 3RX All-in-One Convertible Car Seat

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Product details


The Diono Radian 3RX is the original slim fit 3 across all-in-one convertible car seat, designed to protect from birth to booster seat (5 - 120 lb / 2.2 - 54 kg). Featuring 12 position adjustable head support, extended rear-facing up to 50 lb and steel reinforced frame, expect 10 years of safety from just one car seat.


  • 12 POSITION HEADREST - Creates a safe and comfortable fit for rear facing, forward facing and booster seat modes.
  • INFANT HEAD SUPPORT LINER - Features padded support for added comfort. Simply remove as your infant transitions from rear-facing to forward facing booster seat.
  • 10 YEARS ONE CAR SEAT - From rear-facing to forward facing Radian® 3RX adapts as your child grows from birth to booster. Suitable from 5 – 120 lb / 2.2 - 54 kg
  • 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.
  • REAR FACING FOR LONGER - Designed and engineered to keep your child rear-facing for as long as possible up to 50 lb / 22.7 kg.
  • STEEL REINFORCED FRAME - Mechanically engineered, reinforced steel core, made from automotive grade high strength steel to shield and protect.
Product dimensions
16 in. D x 17 in. W x 28.5 in. H
Head rest positions
Installation Type
Rigid Latch System
TSA Approved
Recommended Age Range
From newborn up to 10 years
Child Maximum Weight (Forward Facing)
40 lbs
Child Maximum Weight (Booster)
120 lbs
Child Maximum Weight (Rear Facing)
35 lbs
Child Minimum Weight (Booster)
40 lbs
Product weight
28.1 lbs
Care instruction
Covers: Machine wash cold, line dry. Shell and Components: Spot clean
Height range
Up to 57.1 in.
Weight Range
5 to 120 lbs
Diono Radian® 3RX All-in-One Convertible Car Seat
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Top reviews
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Kristina Spencer
Kristina Spencer
Verified baby & toddler expert
Reviewed Aug 8, 2022

Fits children from 5 - 50 lbs in rear facing, 22 - 65 lbs in forward facing, and 50 - 120 lbs in booster. Has a Safe Stop energy absorbing harness. Reinforced steel frame and core and reinforced sides. EPS energy absorbing foam for side impact collisions. Memory foam for comfortable seating. Machine washable fabric and includes a cup holder.

Mariah Wear
Mariah Wear
Verified baby & toddler expert
Reviewed Aug 8, 2022

Slim 3 across style car seat designed for use from birth (4lbs) to booster.