DARN TOUGH WORK WILLIAM JARVIS FULL CUSHION CREW SOCK GRAVELThe Darn Tough Work William Jarvis Full Cushion is a no slipping, no bunching and no blisters sock featuring fine gauge knitting which gives the unique "put it on, forget it's on" feel. The sock features a true seamless construction to give you a smooth, almost invisible feel from start to finish. They are made in the USA, are 67% Merino Wool, 31% Nylon, 2% Lycra Spandex and come with an unconditional guarantee.