The Darn Tough Vertex Merino crew is one of the best ultra-light crew height socks on the planet. It provides the perfect amount of cushioning. The naturally antimicrobial sock is an all-weather performance sock that comes with a guarantee for life. It is made of 50% Merino Wool, 48% Nylon and 2% Lycra® Spandex. This 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.