Zensah Compression Leg Sleeves help provide runners and all athletes with calf support, shin splint relief, and decreased leg fatigue. * Leg sleeves sold as a pair. Shin splint relief Used by athletes of all levels - from Olympians to novice runners to football and basketball players Moisture wicking and anti-odor Calf support and injury prevention Improve circulation and faster muscle recovery Compression Leg Sleeve Size Chart When choosing a size, calf size should be use as main determinant. We list height for those who do not know their calf size. If in between size recomend using smaller. XS / S - 9.5" - 12.5" / 24 - 31.5cm / Height < 160cm S / M - 12.5" - 15" / 31.5 - 38cm / Height 163 - 178 cm L / XL - 15" - 18.5" / 38 - 47cm / Height > 180cm BENEFITS OF COMPRESSION Enhanced blood circulation as a result of improved venous return. This means that deoxygenated blood goes back to the heart faster to improve blood flow of oxygen-rich blood back to the body Faster recovery following strenuous exercise by aiding in the removal of blood lactate through improved circulation. Enhanced warm-up via increased skin temperature. Reduced muscle oscillation and vibration upon ground contact, providing stability to the muscle to help prevent micro-trauma, resulting in a faster and easier recovery. Reduced effects of delayed onset muscle soreness in the days following strenuous exercise through alleviating swelling and inflammation. Targeted support: Muscle-mapped 3D ribbing helps provide optimal support to pinpoint areas. Moisture wicking and breathable: Special yarns help to ensure an optimal body temperature while prevent the build up of perspiration. Graduated compression: Helps circulation by increasing venous return. This can help reduce swelling as well as reduce recovery time between workouts. Increased muscle support, which increases performance through improved muscle efficiency. Improved leg power and vertical jump power through enhanced proprioception.