Only Thermoskin Thermal supports have been clinically proven to increase subcutaneous skin temperature for the optimal level of heat therapy. Thermoskin"s patented Trioxion lining creates a microclimate that maintains elevated skin temperature while still allowing the skin to ventilate for long-term user comfort. The spiral structure of the Trioxion lining lifts moisture away from the skin and traps air within the lining to help prevent excessive perspiration. Thermoskin Neck Short - M - Beige Thermoskin Neck Short Useful in treatment of stiff necks, neck-related injuries from sports and Arthritis. Size Chart - Measure circumference of neck for size. Size Fits X-Small 11½"-12¾" Small 13"-14¼" Medium 14½"-15¾" Large 16"-17¼" XL 17½"-19" XXL 19¼"-21½" Available Styles