The Safety 1st™ Boost-and-Go Essential 3-in-1 Booster Car Seat is built to grow with your child while keeping them secure and comfortable on the road. The narrow seat design fits 3 across the back seat of most vehicles. With three modes of use — forward-facing harness booster (30–65 lbs. and 34"–49"), and high-back belt-positioning booster and backless booster (40–100 lbs. and 43.4"–57") —this booster car seat easily converts from one mode to the next as it grows with your child. Kids will love the dual cup holders and parents will love the 7-position headrest, narrow seat design, and lightweight portability.