ECWCS Poly Crew Neck Top provides you with military-grade insulation from extreme cold weather. The warm and lightweight fleece lining on the long sleeve thermal shirt features a warm and lightweight fleece lining that wicks away moisture to keep you dry in extreme cold weather. Elastic wrist cuffs on the cold weather military shirt enable a seamless seal between your shirt and winter gloves. The thermal underwear shirt is part of the ECWCS (Extended Cold Weather Clothing System) used by US soldiers for over 30 years but is also perfect for hunting, hiking, skiing, or any outdoor activity. A perfect match with our ECWCS Poly Bottoms (Item #6245).