The RodiSport Booster Car Seat is designed to easily transform from a traditional booster car seat to a backless booster. That means your not-so-little one can continue to ride protected and comfortably until theyre big enough to sit in the back seat without the extra boost up. The 1-hand headrest adjustment with 10 height positions helps you keep up with growth spurts, and the multiple recline positions offer your little one added comfort whether youre out running errands or on an epic road trip. Vehicle shoulder and lap belt guides make it easier for your big kid to buckle themselves, which gives them a sense of independence and you a bit of freedom. Fits children 40-100 lbs. and 43.4"-57". Actual fit may vary. Not all children will comfortably fit in the seat for the full weight and height ranges listed.