New Does not include tag Size XL The most technically advanced cold weather women’s base layer on the market features FORLOH’s flagship warming technology Trizar™, a NASA Certified Space Technology, woven into every fiber of this shirt. Designed to capture and re-radiate your body heat, it keeps your core body temperature 2.0F warmer for all day comfort. This long sleeve base layer also diffuses moisture caused by sweat to keep you dry and warm.