Thermo skin Knee Patella: The three piece construction of the Thermo skin Knee Patella is anatomically shaped for greater comfort and a better fit. The Knee Patella provides protection and support against general wear and tear, including sprains, strains and weakened knees. The open patella (knee cap) design allows more flexibility around the kneecap. As the kneecap is free from compression, any tenderness or bruising that may be present on the kneecap itself will not be aggravated. The Thermo skin Knee Patella is also useful in the treatment of Chondromalacia Patella and Osgood Shatter"s disease. Thermo skin Technology: Thermo skin provides effective treatment and pain relief for Sports Injuries, Arthritis, Repetitive Stress Injuries and many other conditions. Thermo skin combines compression, support and naturally generated body heat for therapy and pain relief. Clinically Proven: Only Thermo skin is clinically proven to increase blood flow, increase skin temperature, increase muscle temperature and minimize perspiration. This provides heat therapy to prevent, treat and rehabilitate soft tissue injuries. Knee Sizing Guide: Measure the circumference just below the knee cap. X-Small 11 - 12 1/2 Inch. Small 12 1/2 - 13 1/4. Medium 13 1/4 - 14 1/2. Large 14 1/2 - 15 3/4. X-Large 15 3/4 - 17. XX-Large 17 - 18 1/4. If in doubt on Thermo skin sizing it is generally best to select the larger size.