These socks are a "one size, fit most" mid calf-length sock. These socks will quickly become your favorite hiking socks. With the black and green color and the image of Bigfoot, you can't go wrong! The foot bed and cuff are made of bamboo and provides extra padding through the sole, and gives support in the arch and toe. With mesh weave on the calf and foot, you get a breathable, and moisture wicking sock. Made in the USA