Smartwool Merino 250 base layer top features a midweight 100% Merino wool construction for ultimate warmth and breathability. This long-sleeve quarter-zip pullover showcases a distinctive black and white geometric diamond pattern with a contrasting red zipper track. Designed with flatlock seams to minimize chafing and a slim fit ideal for layering during hiking, skiing, or cold-weather outdoor activities. Includes the signature Smartwool logo on the sleeve cuff and zipper pull.