ColdPruf Women's Extreme Performance Dual Layer Long Sleeve Crew Top 96% CPT Performance Polyester / 4% Spandex Imported Tagless Garment with Flat Seams for Comfort 2 Layer for Added Warmth ColdPruf Technical Fiber Polyester with SILVADUR Intelligent Freshness. Odors Off. Fresh On! True Sizing for Accurate Fit Thermachoice System: Very Cold to Extreme Cold Weather / Medium to High Activity