The W's Merino 250 Base Layer 1/4 zip has been elevated to help bring you more comfort to conquer cold weather days and activities. Smartwool has updated this 100% Merino wool fan-favorite with a new fit to improve functionality while enhancing aesthetics. Shoulder panels eliminate top shoulder seams and a flatlock seam construction helps minimize chafing. Add one of our best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, biking or just trying to stay warm when the temperature drops.