Our Grow and Go? 2-in-1 Belt-Positioning Booster Car Seat featuring ComfortWings is made for big kids. It grows with your child and easily converts from a high-back belt-positioning booster (40?100 lbs. and 43.4"?52") to a backless booster (40?100 lbs. and 43.4"?57"). Our innovative ComfortWing design grows up and stretches out?as the headrest rises, the backrest wings expand to 19" (total seat width) to ensure a comfortable fit for your fast-growing kiddo. Its narrow seat fits 3 across the back seat of most vehicles. It?s foldable and lightweight, so it?s easy to move from vehicle to vehicle. The shoulder and lap belt guides help keep the belt properly positioned, making it easy for kids to buckle themselves in. It?s simple to clean with the machine-washable, and dryer-safe seat pad. The Grow and Go? 2-in-1 Belt-Positioning Booster Car Seat featuring ComfortWings also includes 2 removable, dishwasher-safe cup holders.