ColdPruf Men's Eco Terra Single Layer Bottom 70% Recycled Repreve Polyester / 30% Merino Wool Imported Tagless Garment with Flat Seams for Comfort Comfort Logo Waistband with Front and Back Rise and Gussets True Sizing for Accurate Fit Thermachoice System: Very Cold to Extreme Cold Weather/Medium to High Activity Tagless Garment with Flat Seams for Comfort Comfort Logo Waistband with Front and Back Rise and Gussets True Sizing for Accurate Fit THERMACHOICE SYSTEM: VERY COLD TO EXTREME COLD WEATHER/MEDIUM TO HIGH ACTIVITY Moisture Management and Antimicrobial Protection of Fabric by Microban