Deep Heat Back Patch is a pain relief product that provides up to 8 hours of deep relieving warmth. Each box contains 4 large odorless, non-staining patches designed for effective relief of muscular aches, joint stiffness, backache, strains and sprains. The patches are ready to use and can be applied directly to the affected area. The large size makes them particularly suitable for treating back pain and covering larger muscle groups. Being odorless and non-staining makes them convenient for use under clothing. The warming effect helps increase blood flow to the affected area, promoting healing while providing pain relief.