The Safety 1st Boost-and-Go 3-in-1 Harness Booster car seat is built to grow with your child while keeping them safe and comfortable on the road. With three modes of use— forward-facing harness booster (30–65 lbs. and 34"–49"), high-back belt-positioning booster and backless booster (40–100 lbs. and 43"–57"), the seat grows with your child and easily converts from one mode to the next. Kids will love the dual cup holders and parents will love the 7-position headrest, narrow seat design, and lightweight portability.