Hiking socks provide natural warmth and comfort when you're tackling tough trails. 2 Pack. Ribbed knit. 59% acrylic, 20% merino wool, 19% nylon, 2% Lycra spandex. Fits men's shoe size 9-12. Machine wash. Made in the U.S.A. | Woolrich Men's Technical Hiking Socks, 2 Pack, Blue