Air-Stirrup® Ankle Brace with a narrower shell for less bulk in a sneaker or shoe.Indication: Prophylactic protection for chronic ankle instability and uninjured ankleSemi-rigid, anatomically designed shells prevent inversion/eversionPatented Duplex™ aircell system for support, and protectionPre-inflated aircells for easy applicationProphylactic protection for chronic ankle instability and uninjured ankle