Experience FORLOHs award winning base layer top. This 4 way stretch half zip base layer is the first way to improve performance, thanks to world class next to skin comfort and detection avoidance technologies. The most technically advanced baselayer on the market, specifically for cold weather, featuring FORLOH's flagship warming technology Trizar, a NASA Certified Space Technology woven in every fiber of this shirt. Trizar technology is optimized to capture and re radiate your body heat, keeping your core body temperature 2.0F warmer. It diffuses moisture caused by sweat to keep the wearer dry and comfortable. This award winning half zip long sleeve cold weather top combines the best masking technologies available in the outdoor industry to keep you fresh. Proudly, 100% designed, sourced and made in America, FORLOH's line of award winning base layers are the most advanced starting point for every outdoor performance layering system like FORLOH's Tri Layer System.