Smartwool Women's Classic Thermal Merino Base Layer 1/4 Zip size small Color: red striped The Women's Classic Thermal Merino Base Layer 1/4 Zip is a heavier base layer tops and one of our best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help prevent chafing as well as keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more. 100% merino wool