WellPatch Warming Pain Relief Pads is a soft, flexible pad that provides fast, long-lasting, soothing pain relief right where it hurts. The main ingredient, Menthol is a counterirritant that when applied topically, stimulates the nerve endings in the skin to provide feelings of warmth or cold and dull the sense of pain. The pad "distracts" the pain by creating a feeling of cold or heat at the painful area.