Experience top-tier ankle support with Aircast’s patented Aircell technology. Designed to reduce swelling and speed recovery without sacrificing comfort. Trusted by athletes and doctors alike—protect your ankle and get back in the game. The Air-Stirrup Ankle Brace can be used to treat or prevent the following ankle injuries: 3rd Degree Ankle Sprain Acute Injuries of the Ankle. > Ankle Distortion Grade I, II & III > Post-operative Application > Chronic Ankle Instability > Duplex Aircell System for Support & Graduated Compression during ambulation.