Features: -3 STAGE REAR FACING PROTECTION - Features Safe+™ newborn travel high wedge, Safe+™ 2-in-1 infant positioning liner and Safe+™ steel anti-rebound bar for complete rear-facing protection. -REAR FACING FOR LONGER - Designed and engineered with all new Diono Safe+™ protection. Now you can keep your child rear facing for even longer up to 50 lb (approx. 4 years old -10 YEARS 1 CAR SEAT - With 4 ways to travel from birth to booster, the radian® 3QX adapts as your child grows to offer a custom fit from birth to 120 lb. -SLIM-FIT DESIGN FITS 3 ACROSS - Built with our famous radian® slim fit design, to fit 3 across in most vehicles without compromising child or passenger comfort -Anti-slip harness pads for added comfort and safety -As your child grows the Safe+ steel anti-rebound bar increases stability and reduces rebound rotation by up to 50%, so you can keep them safely rear facing for longer, up to 50lb -The Radian 3QX features 6 layers of side impact protection. Interlocking EPS and EPP foam, high density plastic and steel reinforcement combine to create ultimate side impact protection, without compromising 3 across fit in most midsize vehicles -As they transition to forward facing, the Safe+ easy adjust 12 position headrest is contoured to improve child head containment and provides a 22% increase in occupancy range from -Steel reinforced cup holder -SuperLATCH connectors for a easy click installation Rear-facing: 4-50 lb / 1.8-22.7 kg Forward-facing: 22-65 lb / 10-29.5 kg Booster mode: 40-120 lb / 18-54 kg Seated torso height: 7.5-16.5″ / 19-42 cm Overall maximum height: up to 57″ / 144.8 cm Weight: 25.8 lb / 11.7 kg