The Thermoskin Neck Wrap provides heat therapy, pain relief and gentle compression to the neck area. Useful in the treatment of stiff necks and neck related sports injuries and arthritis. The Thermoskin Neck Wrap captures your body"s heat to bring natural relief from neck stiffness and arthritis pain. May be worn during daily tasks or while you sleep. The Neck Wrap has gentle compression and is clinically proven to increase skin and muscle temperatures, thus facilitating blood flow throughout the area to reduce swelling, improve the mobility of joints and ligaments, and help relieve arthritic pain. The Neck Wrap may be worn under clothing and has an adjustable hook-and-loop closure for a personalized fit and compression variation. Thermoskin"s exclusive Trioxon lining is comfortable against the skin and wicks away moisture, allowing the skin to breathe and ensuring comfort during extended wear. 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. Neck Sizing Guide: Measure the circumference around the neck just below the Adam"s apple. X-Small 11 1/2 - 12 3/4 inches. Small 13 - 14 1/4. Medium 14 1/2 - 15 3/4. Large 16 - 17 1/4. X-Large 17 1/2 - 19. XX-Large 19 1/4 - 21 inches. If in doubt on Thermoskin sizing it is generally best to select the larger size.