Body Comfort Reusable Heat Pack, Hand Pack, UnscentedTHE ORIGINAL BODY COMFORT: Body Comfort can be used for cold therapy or simply click for instant heat. COLD THERAPY: Cold penetrates further into the tissues as cold slows circulation, helping to maintain effectiveness of the area being treated. Pain decreases and muscle spasms relax. cold makes the veins in the tissue contract, reducing circulation and swelling. HOW COLD THERAPY WORKS: Once cold is removed, the veins overcompensate and di late, blood