These Masterplast Self Adhesive Instant Heat Pads provide temporary relief from minor aches and pains of muscles and joints and will also alleviate pains such like backache, arthritis, strains, bruises and sprains. Each one is individually wrapped and easy to use. By simply applying to clothing / underwear (Do not apply directly to the skin), after just a few minutes the heat will radiate through the source of pain - increasing circulation, decreasing stiffness and relaxing sore muscles. Fragrance free, non-medicinal and with a thin discreet design you can use Masterplast Self Adhesive Instant Heat Pads to warm you up whenever and wherever you are. Masterplast Self Adhesive Instant Heat Pads stay warm for up to 8hrs.