ECWCS Poly Zip Collar ShirtsStay warm in cold weather climates with Frank Bee ECWCS Poly Zip Collar Shirts. 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
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