The versatile Men’s Merino 150 BASE LAYER Long Sleeve from Smartwool can be worn all year round thanks to its lightweight and breathable qualities. The merino is core spun with nylon for added durability while maintaining its softness against the skin. The fabric wicks moisture away from the body and brings the sweat to the surface where it evaporates without the smell for all-day comfort. The raglan sleeve design and flatlock seam construction help to avoid chafing for ultimate softness and comfort when you’re wearing it under layers.