The AirSport Ankle Brace incorporates clinically proven Air-Stirrup Ankle Brace features, such as a semi-rigid shell and aircells, to provide comfort and support. The foam-filled aircell cushions and supports the ankle. The semi-rigid encased shell offers proven Air-Stirrup support. Additional compression and stabilization is provided by ATF (anterior talofibular) cross strap and integral forefoot and shin wraps. The unique "step-in" design (toes first inserted into the back of the brace) and automatic heel adjustment make the AirSport extremely fast and easy to put on, just: Step In, Strap Up, And Go.