Adjustable width: expandable seat back fits shoulders up to 20u0026#34;, adjustable height: 11 position headrest adjusts up to 6.5″ with one handnRemovable cover for easy cleaning. Machine wash in gentle cycle and drynLATCH system for secure installation (LATCH use is optional)nRetractable cup holders are extra deep to keep drinks upright. Easily converts to a backless boosternNot all seats can be designed to fit in all vehicles. Monterey XT is designed to be used in vehicles with the vehicle seat back.nFits children 40-120 lbs. and 38-63u0026#34; in height^Extra-deep side walls are reinforced with aluminum and lined with EPS foam for superior side-impact protection.^Customizable size, with expandable seat back that accommodates shoulders up to 20u0026#34; wide, and an 11-position headrest adjustment to comfortably fit children as they grow.^2 retractable cup and snack holders^Easily converts to a backless boosternThe Diono Monterey XT High Back Car Booster Seat - Heather boasts features related to both convenience and safety. Designed as a forward-facing booster seat for children 40 to 120 pounds, this seat can grow along with your child. Rather than buy a new booster seat after each growth-spurt, this seat features an adjustable and removable back that fits shoulders up to 20 inches, and an 11 position head rest that adjusts up to 6.5 inches with just one hand. It even has extra deep, retractable cup holders to keep drinks upright when your child has one and to keep the holders out of the way when he or she doesn't have one. Should a drink spill on this seat, there's no need to worry as the 100% polyester cover is removable and machine washable. While all of these conveniences are important, when it comes down to it, it's the safety features that really count. The contoured seat helps your child sit comfortably in the correct position, while the aluminum reinforced sides with EPS foam impact protection system keep your child safe. Additionally, the seat is equipped with an optional LATCH system for secure installation. Forward-facing booster seat for children 40-120 lbs.. LATCH installation system (optional). EPS foam side impact protection system. Comfortable, contoured seat ensures the correct seating position. Adjustable head rest and seat width and height. Easily converts to a backless booster. Extra deep, retractable cup holders. Removable, machine-washable 100% polyester cover. Dimensions: 16L x 20W x 26H in.. Includes 1-year limited manufacturer's warranty.