The Darn Tough No Show Hiker provides legendary Darn Tough performance in a lowest-profile package. The naturally antimicrobial sock is an all-weather performance sock. It is made of 54% Merino Wool, 43% Nylon and 3% Lycra® Spandex. The sock features a performance fit, fine gauge knitting, fast action wicking and True Seamless™ for an ultra smooth, invisible feel. All Darn Tough socks are Still Made in Vermont, USA and carry a lifetime guarantee.