extreme cold weather polypro bottom ,blk -brown -foliage 6280 6248 EXPEDITION WEIGHT POLYPROPYLENE UNDERWEAR The heart of any Extreme Cold Weather Clothing System is a top quality expedition weight polypropylene insulating undergarment. These are the standard U.S. Army issue used with the ECWCS. Silky smooth comfort is obtained by using 100% texturized filament yarns, brushed to a thick, fleecy inside nap. Polypropylene hates water, so body moisture is constantly wicked away from the skin - keeping you