This sock is a do it all adventurer. Made of a highly breathable merino blend knit and designed with impact absorbing cushioning, the durable Quarter crew sock is your choice for long runs, peak to peak traverses, or just chasing after your kids on the playground. Go ahead and treat yourself to a few pairs, these socks won't spend much time sitting in your dresser. Sock size M: shoe size women's 6-10, men's 5-8, sock size L: shoe size women's 10-12, men's 8-12. Material: Wool, Nylon, Spandex.