Built to last, our merino wool performance socks keep your feet comfortable year round. The ultra-soft merino wool regulates temperature, meaning your feet are warm in the cold winter months, but release excess heat in spring and summer. Reinforced soles to limit wear and holes. With a comfortable thickness that isn't too bulky for boots. Perfect for any pursuit, including kicking back around the campfire. Available in regular and long. 38% Merino Wool, 33% CoolMax® Polyester, 24% Nylon, 3% Polyester, 2% Spandex Sizing: Medium 8-9 Large: 9.5 - 11 XL: 11.5 - 13