The Body-Sensors Thermolator II 1/2-Zip Shirt is the perfect base layer due to its rapid evaporation and effective insulation. X-ODOR anti-microbial yarns enable this shirt to resist odor, bacteria, and fungus, while protecting you from harmful Ultraviolet rays at UPF 25+. ec2 Qwik-Dri Thermoregulation Comfort Technology and mesh ZVP Zone ventilation panels keep you dry by accelerating sweat evaporation. At 180g, this medium weight shirt of 86% micro polyester and 14% spandex is soft and breathable with a brushed surface for additional air trapping warmth. This low bulk fabric stretches 360° and has contrasting flat seams for maximum freedom of movement when layering. Shirt features mock neck, set-in sleeves, and a zipper pull with logo. Black.