The Body-Sensors Geo Fleece 1/2-Zip Shirt is the warmest temperature control base layer shirt from Terramar with 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 50+. ec2 Qwik-Dri Thermoregulation Comfort Technology keeps you dry by accelerating sweat evaporation. At 220g, this heavy weight shirt of 95% micro polyester and 5% spandex features dual surface knitting with high-loft grid channels for maximum breathability and moisture transport. Shirt has mock neck, set-in sleeves, and a zipper pull with logo. Contrast flat seam construction.