This Nautilus 3-in-1 car seat helps keep your child secure in a 5-point harness from 20-65 lbs. It converts to a belt-positioning booster from 30-100 lbs. and a backless booster seat from 40-100 lbs. This car seat is steel-reinforced for strength and durability, Side Impact Tested, and has EPS foam. There is also a one-hand height adjustable head rest, recline, and integrated cup holder and storage.