Radian 3R SafePlus All-in-One

Retail Price
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The original 3-across all-in-one Car Seat from birth to booster. Designed with SafePlus engineering to provide the very best in safety, comfort, and style.  Suitable from 4 – 120 lbs.

  • 12 upgrades from Radian 3R
  • 4 Stage Infant Protection
  • Safe Plus Engineering easy-adjust 12-position headrest
  • 6 layers of SafePlus Side Impact Protection
  • Rollover and side impact tested
  • Easy-Click SuperLATCH™ installation system
  • Compact fold and FAA-approved for use on an aircraft
  • XL steel-reinforced cup holder

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The Original 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.

Rear-Facing Longer

The Radian 3R SafePlus is lovingly engineered to keep your child rear-facing up to 50 lbs, with SafePlus™ Engineering.

Comfort and Safety

The Radian 3R SafePlus features a one-hand, easy-adjust 12-position headrest, along with energy-absorbing, rigorously tested Side Impact Protection and extended side walls to reduce the impact of side crashes.

FAA Travel Approved

The Radian 3R SafePlus folds easily for travel or compact storage and is also aircraft-certified (FAA approved), so you can take safety with you wherever you go.

Machine Washable

Featuring memory foam comfort, the Radian 3R SafePlus cover is hard-wearing, easily removable, and machine washable.

Product Specs

Available Colors

Black Jet

Product Weight 29.3 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 57.1 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?

    Car Seat, Product Manual, Safe Stop, Lap Belt Cushion, Rear-Facing Base, Cup Holder, Harness + Buckle Pads.

  • The Radian® 3R® SafePlus™ has 12 upgrades from the Radian® 3R®. These include SafePlus™ side impact protection, a 12 position easy-adjust headrest, an easy fix rear-facing base, and many more.

  • Diono® is the only car seat manufacturer to offer a folding convertible car seat. This makes it the perfect travel seat as it is so compact and folds into a handy car seat travel backpack. Saving space for trunk or home storage.

  • 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 57 in 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.