Radian 3RX All-In-One Convertible Car Seat

by Diono


SKU DI-54011

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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 50 lb.) and featuring an all-new head support infant insert, expect 10 years of safety from just one car seat.

The Radian® 3RX head support infant insert features padded support for cocooned comfort. Then as your infant grows simply remove and keep your precious cargo rear-facing for even longer up to 50 lb (approx. 4 years old). Built with a mechanically engineered, reinforced steel core, made from automotive-grade high-strength steel, the Radian® 3RX is always ready to shield and protect. And when your family grows, the slim fit design will fit 3 across in most vehicles without compromising child safety or passenger comfort.

As travel experts, Diono has naturally built-in super portable features to the Radian® 3RX with original fold for easy transport and storage and steel reinforced cup holders to store essential road trip drinks and snacks. The Radian® is also aircraft certified (FAA approved), so you can take safety with you wherever you go!


  • Designed and engineered to keep your child safe from birth to booster (5 - 120 lbs)
  • The slim fit design allows you to install three across in your vehicle without compromising child or passenger comfort
  • Mechanically engineered, reinforced steel core. Made from automotive-grade high strength steel. What better way to protect your child?
  • With extended rear-facing from birth up to 50lb to keep your child in the safest travel position for as long as possible
  • The removable head support infant insert features padded support for cocooned comfort. Then as your infant grows simply remove.
  • Aluminum reinforced sides and thick energy-absorbing foam distributes crash forces
  • Features easy remove covers! So, when the next journey gets messy, easily remove to machine wash
  • SuperLATCH™ system makes installation easy and super secure. An audible click lets you know when connectors are locked in safe
  • Super portable and fold flat for easy travel. They are also FAA Approved and certified for use on aircraft!
  • Updated fabrics that are easy to remove and wash
  • oklet to improve the user experience
  • Head support infant instead for cushioned comfort 


  • Rear-facing: Suitable from 5 – 50 lbs
  • Forward-facing: Suitable from 22 – 65 lbs
  • Booster Mode: Suitable 40 – 120 lbs
  • Seated torso height: 7.5 – 16.5”
  • Overall maximum height: up to 57”
  • Maximum User Height: 57.1"
  • Number of Head Support Positions: 12
  • Product Height: 28.5"
  • Product Width: 17"
  • Product Depth: 16"
  • Seat Weight: 26.9 lb

Care Instructions:

  • Cover machine washable at 86F/30C/Cold

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