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This is part of the ECWCS (Extreme Cold Weather Clothing System). The heart of the Cold Weather Clothing System is the expedition weight polypropylene thermal underwear. The 100% polypropylene material will wick the moisture away from the skin. The Polypro long underwear have a smooth outer cover with a fleeced inside for extra warmth. The polypro thermal top features a zippered collar that forms a turtleneck or lies flat. The bottoms of the ECWCS Polypropylene Thermals have an elastic waistband, fly flap and knit cuffs. They are machine washable. The thermals are available in sizes Small - XXXLarge.