Nexcare Reusable 3M Hot Cold Pack can be used as an ice pack for pain and swelling, and a heat pack for muscle aches and stiffness. It also includes an elasticated protective cover to keep the pack in place. This product is ideal for pain and swelling caused by bumps, bruises and sprains and for soothing muscle aches and stiffness. CAUTION: Check for leaks before use. Discard if leaking. Individuals with problems in sensing heat or cold should use extreme caution with this product. For external use only. Adult supervision is recommended when using on children. Use with cover for insulation. Do not lie on top of pack, as it could cause pack to break.Talk to your doctor if you have questions about the injury or if swelling or pain persists. TO AVOID BURNS Do not over heat pack. Check temperature before use. Do not use heat therapy with external pain killing products. TO AVOID FROSTBITE Cold therapy should not exceed 20 minutes at a time. This product contains dry, natural rubber.