Deep Heat Patch is a topical pain relief product containing 4 odorless heat patches that provide up to 16 hours of targeted relief from back pain, muscular aches, strains, sprains and bruises. The patches deliver soothing heat therapy directly to the affected area. The patches are designed to be easy to apply and provide long-lasting heat therapy for up to 16 hours per patch. Being odorless makes them discreet to use throughout the day. The heat therapy helps increase blood flow to the affected area to promote healing while providing pain relief. As this is a medicinal product, it should be used as directed and is intended for external use only.