Soft Comfort CorPak Hot or Cold Therapy Packs are a great solution to help relieve headaches, ease pain, and help reduce inflammation associated with strains, sprains, and other soft tissue injuries. Conveniently store packs in the freezer for cold therapy the moment you need it. These packs stay soft and flexible, comfortably contouring to painful areas. Use cold to help reduce inflammation; warm packs in the microwave to aid muscle relaxation and to promote healing. The packs exterior is made of a proprietary blend of synthetic fibers and organic plant materials. The Soft Comfort CorPaks contain more nontoxic, biodegradable fill than traditional packs to retain cold and heat longer. The soft, frost-free pack is gentle on skin and does not need to be wrapped in a towel. For cold therapy, place pack in freezer for a minimum of 1 hour prior to use. For heat therapy, simply heat the pack in a microwave according to the heating instructions printed on the pack. The pack will maintain therapeutic temperature for 20 minutes. When not in use, the pack may be stored in the freezer for convenience. Reusable. Contains no latex. Made in the USA.