What is the Aircast Air Sport Ankle Brace? One of our best selling sports ankle braces to prevent a sprained ankle. Its lightweight but the comfortable plastic stirrups & Velcro straps provide ankle support & restraint. The Aircast Air Sport Ankle Brace offers maximum support to your ankle, slightly more than its sister product, the Aircast A60 Ankle Brace. When can I use it? To prevent a sprained ankle. To improve ankle stability. Particularly recommended for racquet sports such as Tennis, Badminton & Squash. Which size do I need? Based on UK mens shoe size. If you are between sizes, please choose the larger size. Small 5-7.5 (Ladies 4.5-6.5) Medium 8-10.5 (Ladies 7-9.5) Large 11-13 (Ladies 10-13) Shoe Size Conversion Chart How does it work? The Aircast Air Sport Ankle Brace incorporates clinically proven Air-Stirrup Ankle Brace features, such as a semi-rigid shell & Air Cells, to provide comfort & support on both sides of the ankle. This can also be very effective in the treatment of a sprained ankle, Tarsal Tunnel Syndrome, ankle instability or following a broken ankle. Additional compression & stabilisation is provided by the ATF (Anterior Talo Fibular ligament) Velcro cross strap & integral forefoot & shin wraps. This compression is very effective in the treatment of a swollen ankle. Once strapped in place this brace limits ankle movement in order to prevent the ankle rolling over.