Wear for up to 8 hours. Extra strength with 2 pain relievers. Extra Strength Pain Relief: The Icy Hot Pro Pain Relief Patch delivers fast-acting, penetrating pain relief for sore and achy muscles. Backache; muscle strains; sprains; bruises. Fast acting. Comfortable fabric. Easy to apply and remove. Menthol and camphor combine to relieve more points of pain (vs menthol alone). With a cooling hydrogel layer.