Dr. Odin Hot and Cool Pack is transparent and reusable which is designed for Hot and Cold Therapy. This Hot and Cool Pack is designed to give relief from muscle pain. During Cool therapy, blood flow is reduced from a particular area, which reduces the inflammation and swelling that causes pain, especially in joints. It can relieve pain by temporarily reducing the nerve activity. Cold therapy helps to minimize toothache, headache, and fever. Hot Therapy increases blood flow, delivers needed oxygen and nutrients, and removes cell wastes.