ColdPruf Men's Eco Terra Single Layer Long Sleeve Crew Neck Top 70% Recycled Repreve Polyester / 30% Merino Wool Imported True Sizing for Accurate Fit Ring Spun Yarns Provides Exceptional Softness Tagless Garment with Flat Seams for Comfort Tagless Garment with Flat Seams for Comfort True Sizing for Accurate Fit Ring Spun Yarns Provides Exceptional Softness Moisture Management and Antimicrobial Protection of Fabric by Microban THERMACHOICE SYSTEM: VERY COLD TO EXTREME COLD WEATHER/MEDIUM TO HIGH ACTIVITY