The original 2-in-1 booster seat with one of a kind, easy-adjust, separate height and width expansion. Transforms from a high-back booster to a backless booster as your big kid grows. 8 Years One Booster - for your big kid from 40 - 120 lb. It's all you will ever need. Easy-adjust - 11-position headrest that grows up with your child. Engineered for safety and comfort with 2 layers of Side Impact Protection. One of a kind - easy-adjust expandable backrest allows up to 6.5 in to grow with your big kid. With 2 layers of Side Impact Protection and deep padded cushioning. Two built-in retractable 2-in-1 cup holder and snack tray - keeps your big kid's drink close at hand and stows away their essentials. Our contoured premium soft fabrics - with layered foam padding that provide comfort and support can be easily removed for machine washing. SafePlus® belt guides - easy access to seatbelt buckle help your big kid with self buckling - don't forget to check though! Easy, quick and secure installation - engineered with automotive steel LATCH connectors and 2 easy adjust LATCH straps allow you to quickly tighten and secure your booster to your vehicle. Engineered with side impact protection - our rigid shell is reinforced with 2 layers of high-impact aluminum and EPS energy absorbing foam,to protect the head, shoulders, and torso.