Smartwool Men's Merino 150 Bottoms with Navy Waistband Sizes XL-XXLThe Smartwool Men's Merino 150 Base Layer Bottoms work hard to keep you comfortable everywhere from the ski hill to the campsite. Ultra smooth Merino helps regulate body temperature, breathes well and naturally resists odors. The Merino 150 Baselayer Bottom stands apart from your standard layering system with a specialized blend of supersoft, next to skin comfort and workout tested performance. Details: Fully functional fly 87% Merino Wool, 13% Nylon