We strive to keep you cool and comfortable - so we partnered with brrr° fabric technologies to take cooling comfort to the next level. The 3.2 oz. nylon/spandex blend brrr° fabric of the Glacier Short Sleeve Shirt offers the Triple Chill Effect: 3 unique cooling effects that combine to immediately and continually reduce the temperature of your skin. This is achieved through cooling minerals, active wicking, and rapid drying, plus the fabric is completely chemical-free.