The Darn Tough Icefields Brown gives you the sophisticated look that slips from a conference room to a concert. The everyday sock offers silky-thin Merino Wool comfort. The true seamless sock features fine gauge knitting and fast action wicking that pulls moisture away. It is naturally antimicrobial and repels bacteria and odor. The crew height sock is made of 65% Merino Wool, 33% Nylon and 2% Lycra?Â« Spandex.