Deep Heat Period Pain Patch is a long-lasting deep penetrating heat therapy which provides soothing relief from muscular pain and menstrual cramps for up to 12 hours. Patch is air-activated and begins to heat once opened. Patch can be applied directly to the skin and has a long-lasting adhesive. Patch shaped & heating cell designed for ultimate comfort. Odourless, ultra-thin and discreet comfort. Available in 1’s & 3’s