Great for forays into alpine environments, the SmartWool Boys's Microweight Bottoms surround your legs in comfort and performance with next-to-skin custom fitting, a covered elastic waistband, and flatlock seams. SmartWool 100% jersey knit Merino wool that has tiny air pockets providing an insulating layer of natural air, is the Great body temperature regulator, enhancing warmth in the cold. With wool being the most efficient moisture management material on the market, the effective Midweight bottoms keep you dry, itch free, odor free, and ensures all day comfort. Washer and dryer friendly, this easy to care for garment is shrink free, and features a traditional fly.