Thermotech is the premiere professional grade moist heating pad, The Thermotech, heating pad produces moist heat automatically, by attracting moisture, from humidity in the air, This moisture is then retained by the pads outer flannel, cover, The flannel cover is washable, and included at no extra charge, Moist heat, increases circulation, and speeds recovery, by bringing in fresh blood cells, The, application of moist heat has been proven useful in relieving many types of pain,, including arthritic and rheumatic pain, The King Pad (14"" x 26"") is reccomended for large areas such as the back and spine SKU: PAIN015