The Kozy Knee Wrap is the best, most versatile, knee wrap. It can be used at room temperature for support, or hot, warm, or cold for added relief and pain prevention. The Kozy Knee Wrap may also be used chilled from the freezer for a comfortable cold therapy. It can be used around any part of the body from 4" round to 35" round. * Heats in only 15 seconds to 30 seconds in the microwave. * Test the temperature before placing on the eyes or skin. * To freeze, store in a ziplock bag in the freezer.