When the human body gets hot, it sweats to cool itself. Skin Cooler™ works by a series of channels knitted into light fabric. As these channels get wet, they absorb moisture and swell, which dissipates the heat making the fabric against your skin actually cooler. When you sweat, the garment’s temperature drops and creates an actual cooling sensation. Skin Cooler SDS™ offers this cooling effect while offering even more sun protection.