Winner of Backpacker Magazine"s Editors" Choice Award, this all-purpose three-season outdoor sock was designed for rugged day hikes or moderate backpacking. * Arch brace holds the sock in place and adds additional support. Flat-knit toe seam keeps you comfortable throughout the day. Washer & dryer friendly! 74% merino wool, 25% nylon, 1% elastic. * Men"s sock sizes - Medium (fits US shoe size 6-8.5) Large (fits US shoe size 9-11.5) X-Large (fits US shoe size 12-14.5)