The Darn Tough Derby Charcoal is built with the same comfort, durability and function. The silky merino wool and eye-catching look makes it your go-to lifestyle sock for urban treks. The true seamless sock features fast action wicking that pulls moisture away. It is naturally antimicrobial and repels bacteria and odor. The crew height sock is made of 63% Merino Wool, 35% Nylon, and 2% Lycra?Â« Spandex.