Shaped to fit the lower back, this product may be used for hot or cold therapy. The lumbar wrap helps relieve minor muscular backaches and pains. The tough, flexible gel will not leak if punctured and the 4-way stretch material will help ensure product durability and effective therapy and pain management. Like the other Elasto-Gel products, this can be put in the microwave for heating or in the freezer for cooling. Stays soft and pliable, even at -20 F. Provides 20-40 minutes of treatment per application.