Size medium- fits men’s sizes 8-9.5, women’s 10-11.5 Lightly cushioned socks made of a naturally antimicrobial merino wool blend that stands up to multi-day backpacking trips. - Made of merino wool, nylon, and Lycra - Lightly cushioned sole provide great comfort without bulk - Lightweight wool yarn in a ribbed performance knit with seamless construction ensures no slipping, no bunching and no blisters - Darn Tough sources their wool from non-mulesed sheep