1Designed for the chronic sufferer of ankle sprains, the Airsport ankle brace incorporates features of the clinically-proven Air-Stirrup ankle brace like the semi-rigid shells and aircells to provide comfort and support. Additional compression and stabilization is provided by an ATF (anterior talofibular) cross strap and integral forefoot and shin wraps.This is one of the easiest ankle braces to apply. The unique “step-in” design makes the Airsport extremely fast and easy to put on. All you need to do is Step in, Strap Up, and Go!This combination of compression and stabilization, coupled with the easy application makes the Airsport ankle brace ideal for active individuals or athletes recovering from Grade I or II ankle sprains or those who are looking to prevent ankle sprains. Aircast Airsport ankle brace is used to treat or prevent the following injuries: Chronic Ankle Instability. Grade I or II Ankle Sprains.