Rothco ECWCS Poly Zip Collar Shirts Black S k-S. As the mid-layer for the 3rd generation Extended Cold Weather Clothing System the cold weather shirt is constructed of polyester material and offers optimal warmth with the soft and comfortable fleece lining. The ECWCS military shirt features zippered collars that can be fully zipped like a turtleneck or unzipped too cool you off in case you are too warm. Retain body heat with the elastic wrist cuffs as they will fit comfortably and wont allow air to travel up your sleeves. Whether you are in the armed forces going skiing/snowboarding or working outside Rothcos poly zip collar shirt is the perfect lightweight undershirt to keep you warm in the most extreme outdoor conditions.' Specifications for Rothco ECWCS Poly Zip Collar Shirts: Manufacturer: Rothco Age Group: Adults Apparel Fit: Regular Gender: Male Fabric/Material: 100percent Expedition Weight Polyester Fastener/Closure Type: Elastic Wrist Zipper Features of Rothco ECWCS Poly Zip Collar Shirts Material: Fleece Material Specs: 100percent Expedition Weight Polyester Weather: Cold Weather Package Contents: Rothco ECWCS Poly Zip Collar Shirts Rothco ECWCS Poly Zip Collar Shirts Black Small 6240-Black-S