Cura-Heat Period Pain provides targeted, temporary 12 hour pain relief from the aches, discomfort and cramps associated with period pain. Quickly activated, the patch will heat up and its penetrating heat action radiate through to the source of pain - increasing circulation, decreasing stiffness and relaxing sore muscles. Simply open the sachet and apply the adhesive-backed side to the underwear/clothing. Non-medicinal, fragrance-free, and with a thin and discreet design, Cura-Heat provides a convenient way to ease your period pain.