"The Vulkan Classic 3007 Calf and Shin Support Sleeve comprises of three layers: 1. A protective outer nylon top layer 2. A closed cell neoprene layer that retains heat and provides compression 3. The unique Aerotherm spiral lining that allows air to circulate, drawing perspiration away from the skin to reduce skin irritation and increase comfort. The combination of closed cell neoprene and the Aerotherm lining helps working muscles retain natural body heat and protect against sprains and strains which account for almost two thirds of all injuries. Retaining heat increases local circulation, improving elasticity and the range of pain free movement. Healing is promoted and recovery times shortened enabling you to get back to doing the things you want to do much sooner. ? Ideal for managing symptoms of shin splints, pulled calf muscles or strains ? The Aerotherm lining allows the support to retain heat within the joint and muscle to help speed up the body?s natural healing process whilst allowing air t"