Hydrocollator therapy is a form of physical therapy that uses moist heat to relieve pain and muscle spasms, improvement of range of motion, and improvement of localized circulation to the treatment area. Physiotherapist use hot packs that are soaked in a tank with hot water maintained at 160-166F. Hydrocollator Packs are a combination of bentonite clay and other natural fillings that absorbs hot water and retains the heat for a long period of time. Hydrocollator packs are more effective for treating pain than electrical pads because moist heat relaxes muscles and nerves without drawing up moisture from the skin, so the affected area stays hydrated – this is important for a faster healing process.