Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear Facing & Forward Facing, 10 Years 1 Car Seat, Slim Fit 3 Across, Jet Black

10 years of use in one slim convertible car seat

The Diono Radian 3R 3-in-1 convertible car seat is designed to support your child from birth through the booster years, giving families one dependable seat for everyday drives, carpools, and longer road trips. With a slim profile that can fit 3-across in most vehicles, extended rear-facing use, and a reinforced steel core, it delivers long-lasting value without giving up comfort or space.

10 Years 1 Car Seat for growing families

Designed to grow with your child from birth to booster, the Radian 3R offers long-term use in one seat so parents can invest once and stay ready for every stage ahead.

Rear-facing for longer

Supports rear-facing use up to 50 lb, helping families keep little ones in the rear-facing position longer as recommended for the early years.

Slim fit design that helps fit 3-across

The signature Diono slim profile is made for busy back seats and growing families, helping fit 3 car seats across in most vehicles without taking up unnecessary space.

Steel core construction for dependable protection

Built with a mechanically engineered reinforced steel core made from automotive-grade high-strength steel to help shield and support your child on every journey.

Comfort for everyday rides and longer road trips

The deep, supportive seat design helps create a comfortable ride for growing children, whether you’re heading across town or spending more time on the road.

Easy-remove, machine washable cover

Real family life gets messy. The removable cover is designed for easier cleanup, so you can keep the seat fresh after everyday spills, crumbs, and snack-time accidents.

A practical choice for multi-child households

The narrow profile makes the Radian 3R especially useful for families managing multiple children, smaller back rows, or a 3-across seating setup.

Designed for everyday family travel

From school drop-offs to weekend visits and longer drives, the Radian 3R combines extended use, a compact footprint, and dependable construction in one versatile convertible car seat.

Use range

Rear-facing: 5–50 lb (2.3–22.7 kg)

Forward-facing: 26.5–65 lb (12–29.5 kg)

Booster mode: 40–120 lb (18–54 kg)

Maximum child height: up to 57 in (144.8 cm)