... their weight in water. By soaking your cooling scarf in cool water for 15 minutes, these crystals become "energized" and ... to an uncomfortable level. Golf, Tennis, Hiking, Biking...anything! Stay cool and comfortable during these activities. The cooling scarf will contiue ... or spill salt water, gasoline, Dieselfuel or alcohol on your cool Bandana, These will destroy the polymer and its effectiveness. ...