Hot and cold compress has a comfortable soft fabric that conforms to the curves of your skin; fabric is gentle on the skin, frost-free, and ashable Heat pack in microwave or chill in freezer When heated, soothes discomfort from stiff neck, backache, arthritis, sprains and bruises When chilled, soothes discomfort from injury, sprains and strains, muscle soreness, bruises, swelling and tension headaches Non-toxic, non-crystallizing gel allows pack to contour Use standard velcro hook to strap pack in place Tri-Sectional, 8" x 16"