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The Tranzitions 3-in-1 Harness Booster is designed to grow with your child and go with you wherever your journeys take youfrom car to carpool and beyond. This lightweight car seat transitions seamlessly from harness booster 22-65 lb to highback booster 40-100 lb* to backless booster 40-100 lb and features the Simply Safe Adjust Harness System which adjusts your harness and headrest to 8 height positions with no rethreading. It features two removable cup holders to keep your child happy and a machine washable seat pad body insert and harness covers.