A midweight sock that's heavy duty warm, the Santini Lempur Socks are made of a blend of cotton, plus Santini's own special fabrics. Lempur polyester is highly insulating and soft, and Dryarn keeps feet warm by helping to accelerate the evaporation of heat robbing moisture that accumulates within the socks. They're also antimicrobial to fight odor. Contoured arches and reinforced toes and heels make them not just comfortable, but durable, too. Available in the colors Black or White and in three sizes, XSS, ML, and XLXXL.