Nature's coolant is a term used to describe SWEAT, which is a natural bodily fluid produced by the body to help regulate its temperature. SWEAT is composed of water and salt and is released through the pores in the skin when the body is hot or under stress. SWEAT helps to cool the body down by evaporating off the skin, thus reducing the body's temperature. SWEAT is an important part of the body's cooling system and helps to keep the body functioning properly.