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Original Heat Wave Instant Reusable Heat Packs provide therapeutic pain relieving heat in seconds and are reusable for a lifetime. All Heat Wave products are portable, so they can be used at home or office, while driving or commuting, or while attending or playing sports. Heat Wave Medium rectangular packs can be used for: Ankle, calf, knee, thigh, and back pain; general muscle soreness and menstrual cramps. Heat Wave instant Reusable heat packs generate plenty of heat through a physical process. Simply flex the metal disc activator inside the pack, and start the heating process. How Heat Wave Works: There is a small metal activator floating in the bag. If you pinch the disc, so it snaps, the trigger will start a unique, instant crystallization process that produces heat up to 130 degrees Fahrenheit within seconds. The packs will actually change from liquid to solid, conforming to your body, emitting heat through the physical change. These heat packs can produce therapeutic heat for up to two hours or more, depending on heat pack size and application. Heat times are extended by using any form of insulation. Once the heat pack is discharged, just simply recharge it by placing it in boiling water for several minutes and following the instructions printed on each pack. Note: Do not microwave, freeze or puncture the packs. They will not perform effectively. You must boil the packs in water to recharge them. See instructions on the package!