Graco' s top-rated Nautilus 80 Elite 3-in-1 harness booster secures your child in a 5-point harness longer, from 22-80 lbs! The seat onverts to a high back booster from 30-100 lb. and becomes a backless booster seat from 40-120 lb. Its Simply Safe Adjust harness allows you to adjust the harness and headrest together as your child grows, with no time-consuming rethreading. The fuss-free harness allows for easy in and out and the belt lock off makes installation quick and easy. Little passengers will enjoy the premium fabric, personal cup holder and storage compartment.