The 2-in-1 design of the Maxi-Cosi Rodi Booster Car Seat allows the seat to easily convert to a backless booster. Its adjustable backrest offers six different height positions for maximum comfort, while its padded headrest has cushioned sides and energy absorbing EPP foam. Car installation is simple with a three-point seat belt. The Rodi Booster Car Seat is designed for growing children 30 to 100 lbs. and 34" to 57" in height (approximately four to eight years old), and may be converted to a backless booster when the child is 40 lbs. or more.