The SmartWool Men's Merino 250 Baselayer 1/4 Zip has undergone fit updates for improved functionality and aesthetics. With 100% responsibly sourced Merino wool, shoulder panels, and flatlock seam construction, this heavy base layer top is perfect for cold weather activities. Whether skiing, hiking, or running, the shoulder panels eliminate top shoulder seams and the flatlock seam construction minimizes chafing for ultimate comfort. The 10" (25 cm) center front zipper with a semi-locking slider allows for easy temperature regulation. Care for the garment by machine washing warm on a gentle cycle with like colors, and tumble drying low. Cool iron as needed and do not dry clean.