evo.com | Smartwool Long Underwear Bottoms > Built for the days that start cold and somehow get colder. The Smartwool Classic All-Season Merino Base Layer Bottoms bring 100% Merino comfort to your first layer lineup, balancing breathable warmth with a lightweight feel that moves with you. From ski laps to shoulder-season adventures, they're the behind-the-scenes MVP keeping you comfortable all day. Fully Functional Fly 88% Merino Wool / 12% Recycled Nylon Slim Fit Smartwool's slim fit is intended to follow the contours of the body. Flatlock Seam Construction Medium Inseam 30.75" | Smartwool Classic All-Season Base Layer Bottoms Men's 2027 - 2X-Large Black | Nylon/Wool