Our Merino 150 Base Layer Bottoms work hard year-round to keep you comfortable everywhere from the slopes to your campsite. Ultra-smooth Merino helps regulate body temperature, breathes well, and naturally resists odors. What else could you ask for in a base layer? Well, there's also smooth flatlock seams to help minimize chafing, a wide, fabric covered waistband to fit you just right and a nylon core for added strength.