ThermaCare Neck, Shoulder & Wrist is designed to provide you with instant pain relief for tight and tired muscles and can help restore them to their normal state. These discreet pads are worn under clothing and will provide therapeutic heat that lasts for up to 8 hours. They contain heat generating ingredients including; iron, charcoal, salt and water and can penetrate deep to relax tight muscles so circulation flows in. The constant heat provided by ThermaCare increases blood flow to tissues, g