Everything Fourlaps' produces is best in class and they certainly didn't stop at core layers. With 55% bamboo and 22% cotton, Fourlaps Crew's are as soft as socks get. They've created an ideal blend of, environmentally friendly, performance Nylon and Spandex so these socks will simply expel moisture to keep your feet dry. They also hold tight to stay exactly where they should be, all day, every day.