Incorporates clinically proven semi-rigid shell and aircells to provide comfort and support. Additional compression and stabilization is provided by 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. Each, Black Small, Left US Shoe Size: 5.5 - 7 Mens; 5.5 - 8.5 Women