mifold Original grab-and-go Car Booster Seat, Slate Gray, Compact and Portable Booster for Travel, Carpooling and More, Foldable Child Seat Fits into Glove Box and Backpack, Slate Grey A must-have booster seat for children aged 4+, 40-100lbs and 43½-100" tall. Comfort for every day, compact for every adventure! The world’s most compact backless booster is 10x smaller than a traditional booster, and just as safe.