For optimal insulation this cold-weather season, make the Men's Platinum II Crew by Coldpruf your first defense against the elements. This thermal long sleeve shirt features two-layer engineering for trapping heat between the layers and providing a natural warmth shield. It has a crew neck, rib cuffs, flat seams, tagless labeling, drop tail, and streamlined fit. For medium to high activities in very cold to extremely cold conditions, this base layer top naturally wicks away moisture, dries quickly, and fights odor.