The Diono Monterey® XT is the original expandable booster seat. The Monterey® XT easily converts from a highback booster to a backless booster seat, with a wide contoured seat base and two retractable cup holders. Suitable from 40 – 120 pounds, expect 8 years of safety from just one booster seat. Awarded IIHS ‘Best Bet’ Booster Seat, Monterey® XT is lightweight, weighing just 13 pounds, making it super portable and with adjustable headrest and expandable sides, ensures a proper fit for your little one at every age. When your big kids are ready, the Monterey® XT transforms from a high back booster to a backless car seat, with an easy remove backrest offering 2 seats in 1.