ColdPruf Men's Quest Performance Heavyweight Base Layer Pants - Built strong enough to withstand the harsh wilderness, but comfortable enough to keep you out there. So Versatile! Wear as a base layer or as a casual mid or outer layer Single Layer Engineering ColdPruf(R) Technical Fiber Polyester with SILVADUR(TM) Intelligent Freshness Controls odor and inhibits bacterial growth on fabric Wicks and aids in moisture evaporation Brushed inside for warmth and comfort 85% Microfiber Polyester/15% Spandex Fabric Weight: 6.5 oz. Extended body and sleeves for ultimate athletic fit Comfort Waistband, Tagless, and flat seams for added comfort Gussets, front and back rise provide superior comfort and fit Style: 82B