The Smartwool PhD® Outdoor Light Print crew sock will make you experience durability at its peak and features 360° degree printing technology. The lightweight crew sock includes Indestructawool technology for ultimate durability, 4 Degree™ elite fit system for a dialed-in fit, and Virtually Seamless™ toe to offer extraordinary comfort in any trail shoe. The mesh ventilation zones provide optimum moisture management and maximum breathability. It is made of 61% Merino Wool, 35% Nylon, 3% Elastane and 1% Polyester. All Smartwool socks are proudly made in the USA, and carry a lifetime guarantee.