The number one calf guard & best seller around the globe is updated to version 2 It features the same seamless multigradual compression of the original with outstanding strength & durability Studies show a significant reduction in lactic acid during effort Reduced muscle vibration increases your performance during effort & helps prevent injury Your legs will feel fresher & 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