High-Back to Booster: Designed to GrowThe IIHS Best Bet KidFit Zip Air Plus 2-in-1 Booster Seat boasts premium features like an innovative, quick-release LATCH for grab-and-go convenience and 3D AirMesh fabric for breathability. These features and more combine to make the KidFit Zip Air Plus one of the most comfortable, trusted and easy-to-use kids booster seats.Breathability + WashabilityKidFit Zip Air Plus booster car seat includes 3D AirMesh channels throughout the backrest and seat for increased air circulation where kids need it most. The extra padding features a convenient zip-off design, making them easy to remove for cleaning while still maintaining use of the standard fabrics underneath. All fabrics, including armrest covers, are removable and machine washable.Engineered for ComfortKidFit Zip Air Plus features a contoured, ErgoBoost Plus seat with 3 layers of foam padding and a one-of-a-kind zip-on cushioned leg rest for high class comfort. A 2-position backrest adjusts to mimic the vehicle seat position, ideal for a travel booster seat. The backrest is easily removable to create a backless booster for older children.Customized Protection + Ease of UseDuoGuard offers 2 layers of protection: a rigid shell and high-quality, EPS energy-absorbing foam that surround the head and torso with integrated side wings. The high-back booster easily adjusts throughout 10 height positions to extend protection as kids grow.Premium LATCH connectors and a force-multiplying, SuperCinch one-pull tightener stabilize the seat for easy in/out and keep it secured when unoccupied. The upgraded quick-release LATCH provides convenient, one-hand removal from the vehicle LATCH system for a portable booster seat.KidFit Zip Air Plus is designed for children at least 4 years of age, between 38-57"" tall, between 40-100 lbs. in high-back mode and 40-110 lbs. in backless mode and can sit relatively still in the same seated position throughout the car ride.