Adaptive Fabric for Big Kid ComfortFeaturing innovative technology and breathable mesh, the KidFit Adapt Plus booster helps control your childàmicroclimate by keeping them cooler when itàwarm and warmer when itàcold. With patented 37.5 Technology, KidFit Adapt Plus draws moisture to help maintain an ideal core body temperature. The humidity-regulating fabric is permanently embedded with naturally derived volcanic mineral particles to regulate your childàmicroclimate - speeding evaporation to help cool or returning the bodyàown infrared energy to help warm. Combined with strategically placed mesh fabric for airflow and a double layer foam ErgoBoost seat, KidFit Adapt Plus keeps your child cool and comfortable.High Back to Booster: Designed to GrowThe IIHS Best Bet KidFit Adapt Plus Booster Seat is designed with 10 positions of DuoGuard protection for the way kids grow. The easy-adjust headrest ensures proper belt positioning and integrated side wings offer two layers of protection for head and body support with a rigid shell and EPS energy-absorbing foam. The two-position backrest detaches to create a backless booster for older kids.Secure Attachment PLUS Quick RemovalPremium LATCH connectors and a SuperCinch one-pull tightener stabilize the seat for easy in and out and keep it secured when unoccupied. The quick-release LATCH provides convenient, one-hand removal for easy transfer between vehicles, creating an ideal travel booster.All fabrics, including armrest covers, are removable and machine washable. Two dishwasher-safe CupFolders are easy to remove for cleaning and fold in when empty for a narrow booster seat.KidFit Adapt Plus is for children who are at least 4 years of age who can sit relatively still in the same seated position throughout the car ride, 38-57 inches tall, and between 40-100 lbs. in high back booster seat mode or 40-110 lbs. in backless booster seat mode.