A Relief Pak Cold-Hot Donut Compression Sleeve is the healing solution for pain and discomfort from arthritis, muscle strains, sprains, swelling and bruising. Using the Sleeve for cold therapy can reduce inflammation, decrease circulation directly following injury, minimize pain and alleviate muscle spasms. Heat therapy on the other hand, is effective in reducing pain and stiffness, relaxing muscles and increasing blood flow to promote healing. Warm the Pak in the microwave or chill it in the freezer then simply apply it between the Compression Sleeve and your skin for soothing and immediate relief. Whether hot or cold, the Donut remains flexible and securely in place without the use of straps. The Relief Pak Cold-Hot Donut Compression Sleeve is also great for easing sore, aching and tired muscles at the end of a long day. Whichever kind of long-lasting cold/hot therapy you need, the Relief Pak Cold-Hot Donut Compression Sleeve can provide it.