The Smartwool® Classic Thermal Merino Base Layer 1/4 Zip is updated to improve functionality while also enhancing aesthetics. Featuring shoulder panels, a flatlock seam construction to help minimize chafing as well as keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more. It also comes with back body seam wraps to front, raglan sleeves, center-front zip with semi locking slider, and pull-on style.