Helps safely transport your big kid from 4-10 years old, from 40-100 lb* and up to 57 inches tall *To continue to meet industry standards, we have increased the weight minimum from 30 to 40 lb 2-in-1 seat easily converts from a highback booster to backless booster for years of use Full coverage back support even as your child grows EPS, energy-absorbing foam for effective impact management Multi-layer headrest for your child's comfort Padded, height-adjustable armrests and hide-away cup holders will help keep your child content on the road Open-loop belt guides help correctly position your vehicle seat belt Fully adjustable headrest keeps your growing child secure on all of your journeys together This seat is engineered and crash tested to meet or exceed US standard FMVSS 213 Graco ProtectPlus Engineered: a combination of the most rigorous crash tests that helps to protect your child in frontal, side, rear & rollover crashes; additional testing based on the New Car Assessment Program and for extreme car interior temperatures The American Academy of Pediatrics (AAP) and National Highway Safety Administration (NHTSA) recommend that children should use the built-in harness system for as long as possible until they reach the maximum forward-facing weight or height for their car seat, and after reaching the maximum forward-facing weight or height, that children 4 feet 9 inches tall or under should ride in a belt-positioning booster seat Side-impact tested for occupant retention with a standard vehicle harness system in highback booster mode; please consult your vehicle's owner's manual for more specific information on the performance of your vehicle's safety-belt system