Benefits Include: 4 Degree Elite Fit System: For a dialed, performance-oriented fit with flex zone at ankle joint Indestructawool technology features a patent-pending construction method for exceptional durability and comfort Mesh ventilation zones provide optimum moisture management and maximum breathability Virtually Seamless Toe: Smoothed out toe seams for ultimate in-shoe fit and comfort Achilles tab designed to prevent sock from slipping down into footwear Made in USA of Imported Yarn: 54% Merino Wool, 41% Nylon, 3% Elastane Specifications: Sock Height: Low