All Purpose Therapy Wrap, 6" x 24" (TW6005)Can be used hot or cold. They provide moist heat and soothing cold. Stays hot or cold for 20 40 minutes. They are covered with a four way stretch material which allows maximum conformity, heat transfer and comfort. Remains flexible and soft at temperatures as low as 20F. Does not leak, even if punctured. Microwavable or can be heated in a conventional oven. Guaranteed for six months for manufacture defects.