Evaporation of sweat uses energy, and the energy comes from body heat.
When sweat comes in contact with the skin it is cooled as the sweat evaporates.
Energy leaves from body heat when sweat comes in contact with the skin.
energy leaves from what when sweat contacts with skin
  * radiation
  * heat energy
  * expelled
  * vapors
  * body heat
  * heat produced
  * conduction
  * metal