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

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radian® 3RX 2020

The original All-in-One convertible car seat designed to fit 3 across and with Diono's famous steel core inside for optimum safety. Now rear facing for even longer (up to 50lb/ 22.7 kg.) and featuring all new head support infant insert, expect 10 years of safety from just one car seat.

10 Years One Car Seat

With 4 ways to travel from birth to booster, the radian® 3RX adapts as your child grows to offer a custom fit from birth up to 120lb / 54kg.

The Original 3-Across

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

Rear Facing Longer

Designed and engineered to keep your child rear facing even longer up to 50lb / 22.7kg (approx. 4 years old).

New for 2020

  • Rear-facing for longer: Now up to 50 lbs / 22.7 kg
  • Head support: New head support infant insert for cushioned comfort
  • Improved fabrics: New and updated fabrics that are easy to remove and wash
  • Instruction Booklet: New booklet to improve the user experience


  • Suitable up to 120 lb: The 2020 radian® 3RX is now suitable from birth up to 120 lb in high back booster mode. 
  • Steel core: Mechanically engineered, reinforced steel core. Made from automotive grade high strength steel.
  • Head support infant insert: The removable head support infant insert features padded support for cocooned comfort. Then as your infant grows simply remove. 
  • Side impact protection: Aluminium reinforced sides and thick energy absorbing foam distributes crash forces.
  • Easy remove covers: Radian 3RX 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 2020 radian® 3RX features all new XL hardness pads with anti-slip backing for extra comfort and safety.
  • Memory foam comfort: The radian® 3RX features memory foam padding in the seat base for optimum child comfort.
  • Cup Holder included: radian 3RX includes a steel reinforced cup holder for those all important road trip drinks and 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: 5 - 50 lbs
    • Forward-facing: 22 - 65 lbs in a 5-point harness
    • Booster: 40 -120 lbs (and up to 57")
  • Dimensions: 28.5" H x 17" W x 16" D
  • Folded: 28.5"H x 17”W x 7"D
  • Weight: 26.8 lbs


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