VoltaHeat Pain Relief Patches provides up to 8 hours of heat for soothing targeted heat therapy relieving muscular aches and pains. VoltaHeat Pain Relief Patches are designed for use on the back, shoulders, and neck. Each patch provides penetrating soothing heat, increases blood flow to the area, helping to ease muscle tension and relieve pain. From the makers of Voltaren, Voltaheat Pain Relief Patches are a no mess & easy to use format that is odourless and ideal for on-the-go pain relief. Targeting pain right where it hurts, each patch can be applied directly to the skin and can be worn under clothing to provide long lasting relief.