At the first sign of sweat, PermaFrost Shirts’ CoolCore® technology kicks in – dispersing perspiration 360° to the fabric’s surface for fast evaporation and powerful cooling action. The 95% polyester/5% spandex fabric feels light, smooth and cling-free. Odor-fighting finish prevents you from stinking up the jobsite. Mesh panels at underarms and sides for blow-by-blow ventilation. Wear one on the hottest day and there’ll be frost in your forecast.