ColdPruf Men's Platinum Dual Layer Bottom Inside 100% CPT Performance Polyester/ Outside 70% Polyester, 30% Merino Wool Imported Tagless Garment with Front and Back Rise and Flat Seams Comfort Logo Waistband and Gussets True Sizing for Accurate Fit Thermachoice System: Very Cold to Extreme Cold Weather / Medium to High Activity Ring Spun Yarns Provides Exceptional Softness ColdPruf Technical Fiber Polyester with SILVADUR Intelligent Freshness. Odors Off. Fresh On!