Dynarex instant hot packs are emergency pain soothers that comfort users of neck pains, stiffened muscles, and arthritis as well as back & shoulder injuries. These warm the injured area, thereby relaxing the stress and soothes pain. The Dynarex hot pack is available in a convenient packaging that can be easily carried along. They are readily useable - just squeeze and apply. The pack is flexible enough to reach the difficult-to-reach areas. Its special plastic double bag assures no leakage.