The Darn Tough Standardmen's sock is a versatilesock with performance and comfort in mid-calf with a dollop of cushioning on the bottom of the sock. It features Fast Action Wicking removes moisture and is fast drying. The all weather performance sock is naturally antimicrobial. The merino wool provides breathability and comfort in all conditions. It comes with a lifetime guarantee and is made of 47% Nylon, 46% Merino Wool, and 7% Lycra Spandex.