Product Dimensions – 9.5″ x 13″ x 1″ The Thermal-Aid heating and cooling packs are engineered to eliminate pain and swelling from arthritis, sports injuries, and more. These products range in size and can be used as hot or cold therapy packs. The packs can be heated in the microwave and cooled in the freezer and are made from 100% natural cotton and a heating/cooling element composed of a specially engineered corn. Unlike other natural packs, Thermal-Aid packs are washable, which allows you to use them repeatedly.