Smartwool Merino 250 base layer top in a versatile charcoal gray heather. This high-performance piece features a quarter-zip neckline with a mock neck collar and flatlock seam construction to minimize chafing. Crafted from 100% Merino wool, it offers natural temperature regulation and moisture-wicking properties, making it an ideal choice for hiking, skiing, or everyday cold-weather layering. The slim-fit silhouette is finished with the signature Smartwool logo near the hem.