Terramar® Men's Two-Layer Authentic Thermal 2.0 Crew-Neck Baselayer Top will keep you warm and dry during all your winter cold-weather activities with ec2® Qwik-Dri ™ Thermoregulation Comfort Technology.Two layer construction: inside/outsideFlat seam constructionec2® Qwik-Dri ™ Thermoregulation Comfort TechnologyAnti-microbial for freshnessRapid moisture managementTwo layer construction traps air for better insulatingUPF Rating 25+ sun protection Product Features: Fabric:100% polyester, 200g Terramar Men's Two-Layer Authentic Thermal 2.0 Crew-Neck Baselayer Top