Made by Vulcan, their Advanced Elastic Ankle Support contains superior performance materials that help the body's natural healing process. Featuring Nano Flextraâ„¢, this is a super, multifunctional material which in addition to assisting with healing also provides warmth & comfort around the ankle. Made from 60% Flextraâ„¢, 16% polyester, 14% rubber & 10% spandex, the professional design means the support offers unique heat retaining properties that increase blood flow around the joints during activities to speed up the body's natural healing process. Technically designed, the support also provides antibacterial properties to encourage cellular growth. The cross sectional design helps remove excess sweat keeping the skin dry, comfortable & odour free. The support also provides a 4-way stretch, lightweight, uniform compression for overall comfort & retains performance even after several washes. To ensure the best fit, please see the following sizing guidelines: Small: 21-23.5cm Medium: 23.5-26cm Large: 26-30cm