The Thermoskin Tennis Elbow Strap with Pad helps prevent and treat medial and lateral Epicondylitis. Helps prevent overloading where forearm strain is an occupational hazard. Features an adjustable strap for rotational stability and a pad to provide localized compression to the problem area. Thermoskin Technology: Thermoskin provides effective treatment and pain relief for Sports Injuries, Arthritis, Repetitive Stress Injuries and many other conditions. Thermoskin combines compression, support and naturally generated body heat for therapy and pain relief. Trioxon Advantage: Thermoskin"s exclusive Trioxon lining is soft and comfortable against your skin. Trioxon captures your natural body heat for therapy and pain relief. The three dimensional Trioxon lining provides insulation and wicking of moisture via air circulation. This allows the skin to remain well oxygenated and comfortable for extended periods. Clinically Proven: Only Thermoskin 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. Tennis Elbow Strap Sizing Guide: Measure circumference in the upper forearm area where the Strap will be applied. X-Small 8 1/4 - 9 Inch. Small 9 1/4 - 10 1/2. Medium 10 3/4 - 12 1/4. Large 12 1/2 - 14 1/4. X-Large 14 1/2 - 16 1/2. XX-Large 16 3/4 - 18 3/4 Inch.