Hot & cold application. For shoulder, head, abdominal, knee, elbow, arm, leg. Latex-free. Non-toxic, microwave safe. Washable. Flexible when frozen. Protective insulated sleeve. One size fits all. This is a recognized medical treatment for everyday minor injuries. Heat therapy is generally applied to chronic or persistent injuries such as minor muscle and joint pain, stiffness, muscle spasm and cramps. Cold therapy is a recognized medical treatment for everyday minor injuries and generally applied within 72 hours following sprains, strains, swelling, headaches, nose bleeds, toothaches, minor cuts and scrapes, insect bites and minor injuries. 5 x 10 in (128 mm x 255 mm).