ESI No Dol Thermo Patches 3 U. Thermal patches, with heat effect. Provides quick relief from muscle and/or joint pain. Relieves acute pain caused by rheumatism, acute pain in muscle aches, stiffness, torticollis and joint pain. Formulated with a mixture of iron powders, which when in contact with oxygen generates a heat source naturally. Duration of up to 8 hours at a comfortable temperature. Once the hours are up, you can apply another patch. Do not exceed 24 hours in a row.