The Elastogel Hot/Cold All Purpose Packs are used to offer hot or cold therapy to any area where a flat, sheet form will suffice. The tough, flexible gel will not leak if punctured and the 4-way stretch material will help assure product durability and effective therapy management. Elasto-Gel Therapy Products are designed to provide moist heat therapy or soothing cold therapy for relief of minor muscular and joint aches and pains. The hot or cold therapy will last 20 to 40 minutes per application. The product is held in place with hook and loop type closures, which allow the user to move about during therapy. The product is microwavable so it can provide nearly continuous heat therapy. When used cold, the product conforms to contours, even at -20F (-30C), allowing comfortable soothing cold applications.