Relief for minor soft tissue injuries of the head and face. Use cold to reduce swelling, numb the area, and reduce pain. Use hot to stimulate blood circulation and provide soothing relief. Convenient relief for sinus headaches. *NOTE: Some people have asked to return this item because they say is does not get cold like the direct application of ice. That is true, as there is a layer of Lycra between the coolant and your skin. Plus because most household freezers are actually too cold for direct applications this safeguards you against over cooling the treatment area.