The original 3 across All-in-One Car Seat just got better. Upgraded with 15 improvements from the award-winning Radian® 3RXT®, the Diono Radian® 3RXT® SafePlus™ features Diono SafePlus™  engineering, SafePlus™  anti-rebound panel and advanced SafePlus™ Side Impact Protection for complete protection from birth to booster 4 - 120 lb / 1.8 - 54 kg Features: -15 UPGRADES FROM RADIAN® 3RXT® - Includes SafePlus® easy adjust 12-position headrest, 6 layers of SafePlus™ Side Impact Protection and SafePlus™ testing. -COMPLETE REAR-FACING PROTECTION - SafePlus™ steel anti-rebound bar reduces rebound rotation by up to 50% for extended rear-facing travel up to 50 lb. -SAFEPLUS™ ENGINEERING - Features a unique combination of engineering features and testing to the highest safety standards to ensure we have the safest seat possible. -10 YEARS ONE CAR SEAT - From rear-facing to forward facing Radian 3RXT® SafePlus™ adapts as your child grows from birth to booster. Suitable from 4 - 120 lb / 1.8 - 54 kg. -THE ORIGINAL RADIAN 3 ACROSS - Built with our famous 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. Minimum User Weight: 1.8 kg / 4 lb Maximum User Weight: 54 kg / 120 lb Minimum User Weight - Rear Facing: 1.8 kg / 4 lb Maximum User Weight - Rear Facing: 22.7 kg / 50 lb Maximum User Weight - Rear Facing LATCH: 15.8 kg / 35 lb Minimum User Weight - Forward Facing: 10 kg / 22 lb Maximum User Weight - Forward Facing: 29.5 kg / 65 lb Maximum User Weight - Forward Facing LATCH: 18 kg / 40 lb Minimum User Weight - Booster: 18 kg / 40 lb Maximum User Weight - Booster: 54 kg / 120 lb Maximum User Height: 145 cm / 57.1 in Number of Head Support Positions: 12 Product Height: 72.4 cm / 28.5 in Product Width: 43.2 cm / 17 in Product Depth: 40.6 cm / 16 in Seat Weight: 13.9 kg / 30.6 lb Product Height - Folded: 72.4 cm / 28.5 in Product Width - Folded: 43.2 cm / 17 in Product Depth - Folded: 29.2 cm / 11.5 in