Therapeutic heat from the Deep Heat Pain Relief Heat Patch provides targeted pain relief right where you need it. Plus, penetrating heat helps relax stiff, sore, aching muscles and joints, helping to restore movement. It can be used for back, hip, thigh, calf, arm, neck, and shoulder pain. Recommended for muscular pain, strains, and joint stiffness. It assists in the healing process by increasing blood flow to the affected area, providing oxygen and nutrients.