Abstract: A cover for an instant hot or cold pack for use on injured portions of the body where immediate heating or cooling of an affected body part is required. The cover is adapted to be selectively used in either a folded configuration wherein the pack is retained within the cover for placement on the injured area of a large body portion, or in various wrap around configurations wherein the cover can be fastened in surrounding relationship with limbs of various sizes and configurations with the pack retained in intimate contact with the injured area.