DESC: The TurboBooster youth booster car seat is to be used forward-facing only. When used in its high back form, the TurboBooster youth booster car seat is for children ages 3 to 10 years old, from 30 to 100 lbs and between 38 and 57 inches. When the back is removed, the TurboBooster youth booster car seat is for children ages 4 to 10 years old, between 40 and 100 lbs and 40 to 57 inches tall.