May be used for hot/cold therapy. These specially designed products are ideal to help restore flexibility and provides excellent therapy for minor injuries during and after rehabilitation exercises. 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 20 degrees. Does not leak, even if punctured. Microwavable or can be heated in a conventional oven.