Year-after-year the men’s MERINO 250 Base Layer Crew from Smartwool is their best-selling shirt. This warm, breathable, and moisture-wicking base layer features all the benefits of its odour-resistant 100% merino construction. It now features a slimmer fit but still has a smooth wear-after-ski crew neckline. Flatlock anti-chafing seam construction and shoulder panels further improve your comfort.