What Makes Up Sweat. To outsmart sweat, it helps to know exactly what it does. When this mix of water, salt, and other minerals evaporates from your skin, it cools you down, allowing your body to maintain its core temperature.roducts That Reduce Sweat. When the weather heats up, products that help keep you dry need to work overtime. We put the latest to the sweat test. The Product. Secret Outlast ($5, drugstores). The Claim. It fights wetness and odor-causing bacteria for as long as 48 hours.