Abstract: A therapeutic heating sleeve (10) consisting of a laminate pad (20) with an exterior cover (22), a batting (24), a polyester lining (26), a heating wire (28) and an interior lining (30) having a hook and loop fastener (32) that is attached on the exterior cover (22) and the interior lining (30). The laminate pad (20) has a lower portion that is in the shape of a human arm and an upper portion that is in the shape of a human shoulder. The heating sleeve (10) is completed by overlapping the pad's right side onto the pad's left side and attaching the two sides with the hook and loop fastener (32), thereby forming an open-ended sleeve. An electrical control is removably attached to the laminate pad (20) for applying electrical energy to the heating wire (28), thereby creating heat for baseball pitchers to warm up their arm and shoulder prior to pitching.