The number one calf guard and best seller around the globe is updated to version 2. It features the same seamless multi gradual compression of the original with outstanding strength and durability. Studies show a significant reduction in lactic acid during effort. Reduced muscle vibration increases your performance during effort and helps prevent injury. your legs will feel fresher and go longer. new for version 2 is the exclusive K-Protect technology an ergonomic band which applies compression to the patellar tendon to provide extra knee support.