Versatile packs offer excellent conformity and comfort. Made of a tough, flexible gel covered with a four-way stretch fabric for maximum conformability and temperature transference. Place in a microwave or conventional oven for heat therapy or in a freezer for cold therapy. Waterproof packs retain heat or cold for 20 to 40 minutes. If punctured, the gel will not leak and the wrap remains usable. The inner-plastic cover may be surface sterilized with standard disinfectant solutions. Guaranteed for six months.