The best cold weather gear you will ever wear!. Made from texturized filament yarn brushed to a thick, fleecy inside nap, for a soft comfortable feel. Moisture is wicked away so you are always dry and warm. Mil-Spec fabric weight: 10.5 oz per square yard. Turtleneck top has a zipper neck that lays flat or zips up into a turtle neck. Crew neck Top lays better under BDU shirt.