Hot Chillys new Clima-Tek fabric features a buttery soft, cottony hand, with all of the performance of a polyester/spandex. Perfect for summer camping in the mountains and winter wear anywhere. Clima-Tek technology is designed to keep you comfortable and stylish year-round. Whether you're out camping or indoors, the fabric will keep you protected from the elements. Clima-Tek fabric is designed to wick moisture away from your skin, making it perfect for both hot and cold conditions. Enjoy the comfort of cotton with the breathability and durability of a synthetic fabric. | Hot Chillys Men's Clima Tek Zip T Baselayer Top