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The heart of the Cold Weather Clothing System is expedition weight polypropylene thermal underwear. The Polypro Thermal Long underwear is used as part of an ECWCS clothing system. (Extreme Cold Weather Clothing System). The 100% polypropylene material will wick the moisture away from the skin - you stay dry and cozy in bad conditions. The Polypro long underwear have a silky smooth comfort. The long under wear are made of a 100% texturized filament yarns, brushed to a thick fleecy nap. Microban® For anti-microbial and odor defense. The polypro bottoms of the ECWCS Polypropylene Thermals have an elastic waistband, fly flap and knit cuffs. The black poly pro is machine washable. The black thermals are available in sizes Small - XXXLarge.