Smartwool Merino 150 Base Layer Bottoms work hard year-round to keep you comfortable everywhere from the slopes to your campsite. Their ultra-smooth Merino helps regulate body temperature, breathes well, and naturally resists odors when you're wearing these base layer pants. They've added smooth flatlock seams to help minimize chafing, a wide fabric-covered waistband to fit you just right, and a nylon thread core for added strength.