The original all-in-one convertible car seat since 2006
Radian® was born when our expert team recognized the need for a better way to prepare for your growing family and busy back seats while keeping your very important passenger as safe as possible.
The original 3-across Radian® features a slimline, space-saving design at only 17” wide that allows you to install three across in most mid to large-sized vehicles in a variety of configurations from rear-facing to forward-facing with harness, fitting 3-across each and every time.
Engineered with the famous diono® full steel core for maximum safety. This high-strength core has inherent integrity and forms an unyielding structure to shield and protect your child. We didn’t stop there; our aluminum-reinforced sides and thick energy-absorbing foam distribute crash forces to guard your child’s vulnerable side and head, which is critical in side-on collisions.
Shop the 3-across family
Radian® 3RXT® SafePlus™ Max
Our newest 3 Across All-In-One™ convertible car seat$449.99
Shop NowRadian® 3RXT® SafePlus™
Our best selling 3 Across All-In-One™ convertible car seat with SafePlus™ engineering$399.99
Shop NowRadian® 3R® SafePlus™
The original 3 Across All-In-One™ convertible car seat with SafePlus™ engineering$369.99
Shop NowRadian® 3R®
The original 3 Across All-In-One™ convertible car seat$329.99
Shop NowFind the right car seat for you
Radian® 3RXT® SafePlus™ Max
Our newest 3 Across All-In-One™ convertible car seat. with SafePlus™ engineering.
- MSRP - $449.99
- Slim design to fit 3-across in most mid-size vehicles
- Reinforced automotive-grade high-strength steel core
- Rear-facing for longer - from birth up to 54 kg
- FAA-approved travel-ready foldable car seat
- Machine washable easy to remove seat cover
- One hand easy-adjust 12-position headrest
- 8-layer aluminum reinforced side impact protection
- 2-in-1 anti-rebound bar and calf support
Radian® 3RXT® SafePlus™
Our best-selling 3 Across All-In-One™ convertible car seat. with SafePlus™ engineering.
- MSRP - $399.99
- Slim design to fit 3-across in most mid-size vehicles
- Reinforced automotive-grade high-strength steel core
- Rear-facing for longer - from birth up to 54 kg
- FAA-approved travel-ready foldable car seat
- Machine washable easy to remove seat cover
- One hand easy-adjust 12-position headrest
- 6-layer aluminum reinforced side impact protection
- Steel anti-rebound bar
Radian® 3R® SafePlus™
The original 3 Across All-In-One™ convertible car seat with SafePlus™ engineering.
- MSRP - $369.99
- Slim design to fit 3-across in most mid-size vehicles
- Reinforced automotive-grade high-strength steel core
- Rear-facing for longer - from birth up to 54 kg
- FAA-approved travel-ready foldable car seat
- Machine washable easy to remove seat cover
- One hand easy-adjust 12-position headrest
- 6-layer aluminum reinforced side impact protection