The Back on Track Matress Overlay is quite useful when you have a general body ache or back pain, or just want to sleep better. Many users have noted that they feel less stiff in the morning. The pad is comfortable to sleep on during summer as well as winter as it tends to neutralize the temperature. It is recommended to cover this product with a thin bed sheet at all times during use. Designed with a revolutionary fabric impregnated with Ceramic powder, based on FAR Infrared Ray therapies that have been widely used in Europe and the Orient. The Ceramic powder reflects body heat in the form of these rays, which substantially increase blood flow, thus reducing pain and swelling, as well as stimulating the healing process. Helps keep muscles loose and supple. Relieves pain and tension in muscles, while decreasing inflammation and increasing blood circulation. Speeds up healing process Prevents damage in muscles or joints Could be your answer to a great night's sleep. Size: King - 71" x 79"