The Shock Doctor ultra knee support with bilateral hinges offers most advanced support and protection for the knee. It features bilateral support hinges and tempered aluminum stays which maximise stability, increase overall protection, and allow you to maintain a high level of performance. The premium stitching laced into the assembly, the patella support and Lycra binding are engineered for the most strenuous activities while still providing optimum comfort. Convenient finger tabs provide excellent grip pull whenever you put on this high level knee support.Performance Grade 3: Medium stability, recovery and protection for moderate to major injuries.Dual hinges and stays for optimal protection and supportX-fit technology offers security and comfortPatella padding for increased kneecap protectionLycra and N-Tex technology for moisture wicking and heat therapyAnti-microbial technology integrated into the fabric for odour reductionSize: S(12.25-13.25"), M(13-14"), L(13.75-14.75"), XL(14.5-15.5"), XXL(15.25-16.25")Measure knee circumference 2" below center of knee cap (patella)