The AirSelect Short is a short pneumatic walking brace. Sizing Guide According to AUS shoe size. Please refer to one of the listing images for Sizing Chart if it is not displaying below. Contents 1 x Aircast AirSelect Short Ankle Walker Moon Boot Warnings/Precautions Do not over-inflate aircells. Improper aircell inflation may cause significant skin irritation, especially in people with diabetic neuropathy (a diabetic nerve condition). Check your skin frequently for “hot spots” and skin irritation. If you see any skin changes or feelings of discomfort, reduce the aircell compression. Do not use this device if you cannot feel sensations whether due to post-op anesthesia, nerve, skin or other conditions. Use caution when walking on slippery or wet surfaces to avoid injury.