Darn Tough Coolmax® Hiking Socks are comfortable and durable. These socks have been tested on long trails all over the globe. Made with 100% synthetic material, this sock is a nice option for anyone with a true wool allergy. The Coolmax® yarn is moisture wicking and fast drying. This sock is a medium weight full cushion. Cushion everywhere. Cushion cushion cushion. Nice and warm. This sock will hit around mid-calf - a good inch or so above the top of a standard boot. All Darn Tough socks are made in the USA and backed by Darn Tough#39;s Lifetime Guarantee. Specs: 60% Coolmax Polyester 31% Nylon 6% Acrylic 3% Lycra Spandex