Can be used for heat or cold therapy. Made from tough, flexible gel covered with a four-way stretch material allowing maximum conformity, comfort and hot/cold transfer. Specially designed to hot or cold therapy. Can be placed in the microwave or a conventional oven for heat therapy or in a freezer for cold therapy. Retains heat or cold for 20 to 40 minutes. If punctured, the gel will not leak and the wrap remains usable. Latex free.