The Thermoskin Double Shoulder provides heat therapy and support for both shoulders. Helps reduce arthritic shoulder pain with heat therapy and light compression. Also useful as an adjunct in rehabilitation after surgery or to stimulate blood flow in tendonitis cases. Not to be used for dislocations or bracing. 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. Shoulder Sizing Guide: Measure circumference around middle of the chest. X-Small 33 - 35 inches. Small 35 1/4 - 37 1/2. Medium 37 3/4 - 40 1/4. Large 40 1/2 - 43. X-Large 43 1/4 - 47 1/4. XX-Large 47 1/2 - 51 1/2. 3X-Large 51 3/4 - 56. 4X-Large 56 1/4 - 60 1/4. 5X-Large 60 1/2 - 64 1/2 inches.