Heat pack
Encyclopedia
A heat pack is designed to warm up one's body to prevent swelling of injuries. A heat pack can be:
  • an ice pack
    Ice pack
    An ice pack or gel pack is a plastic sac of ice, refrigerant gel or liquid, or, in an emergency, even frozen vegetables. The refrigerant, usually non-toxic, can absorb a considerable amount of heat, since its enthalpy of fusion is high...

     that is heated (containing a liquid or a gel with high specific heat)
  • a heating pad
    Heating pad
    A heating pad is a pad used for warming of parts of the body in order to manage pain. Localized application of heat causes the blood vessels in that area to dilate, enhancing perfusion to the targeted tissue...

     that heats when you start the crystallisation process
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