Our new Mens Merino 250 Base Layer Pattern 1/4 Zip has been rebuilt to provide you with a more functional and fashionable garment. As one of our heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more.