With Elite MCS Compression Calf Guard, 2XU introduces a new generation of compression technology. MCS (Muscle Containment Stamping) provides extra support to those muscle groups that need it most. Elite MCS Compression Calf Guard is made of the powerful PWX FLEX (70D) material. On the inside of Calf Guards, 2XU has developed MCS, which is a system for targeted and more powerful compression. The MCS system has extra patterns that follow the muscle structure, tendons and nerve groups on the calf muscle. Through this system, the calf support provides even stronger pressure against the most vulnerable muscles, reducing tearing and damage. Calf Guards are antibacterially treated, have flat seams and carry away sweat from the skin.