MaxSane Instant Reusable Heat Packs provide therapeutic pain relieving heat in seconds and are reusable for a lifetime. It can be used at home or office, while driving or commuting, or while attending or playing sports. Packs can be used for: Ankle, calf, knee, thigh, and back pain; general muscle soreness and menstrual cramps. MaxSane instant hand warmers fit comfortably in a pocket or in mittens. Ecofriendly + Cost Savings. Generate plenty of heat through a physical process. Simply flex the metal disc activator inside the pack, and start the heating process. Heat therapy has been a natural remedy used in both to relieve pain and enhance the recovery process. By increasing the temperature of the skin surface and underlying tissues, heat stimulates the thermos receptors-sensory receptors that respond to heat and cold-which then help block transmissions of pain signals to the brain. This translates into a significant decrease of discomfort. Heat therapy increases blood flow, which helps to decrease stiffness, relaxes sore muscles, and provides soothing comfort. Heat should not be used on areas of swelling and bruising. (If swelling occurs, use cool pad, then apply heat after the swelling goes away). Imagine all of the uses of a heating pad that doesn't have to be plugged in, preheated or microwaved. A heat pack that heats to a safe preset temperature and is completely reusable. To Activate: Press metal disk floating in to the gel of the range of Magic Heat Pad to generate heat. To Recharge: Put the range of Magic Heat Pad wrapped in a thin cloth and place it in boiling water for 5 to 10 minutes or till all crystals dissolve properly If any crystal is still left out, continue to boil again to avoid re-crystallization. When range of Magic Heat Pad is completely clear, it can be use two times. First just after boiling and second when its cools. Uses: Our Incredible Magic Heat Pads can be used for: Treatment of sports injuries, Arthritis pain, Back pain, Sore neck, Menstrual cramps, Tooth aches, Hypothermia, Sprains, Growing pains, Brest toughness, Joint pain, Muscular pain etc. Safety Note: Do not microwave or puncture the packs Avoid direct contact with heating container