The Darn Tough Work William Jarvis Full Cushion is ano slipping, no bunching and no blisters sock featuringfine 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 unconditionalguarantee.