The Icy Hot Pro Medicated Large Pain Relief Patch delivers the dual action of icy cooling followed by warming heat to block pain signals in large muscle groups like the back and thigh. Infused with 7.5% menthol for maximum over-the-counter topical relief, the patch adheres firmly through movement and perspiration. Odor-free and discreet under clothing, it provides up to 8 hours of continuous pain relief per application.