When you need a little more cushioning for a long hike or backpacking trip, this crew sock provides ample protection, hitting just above your boot tops. Features SmartWool's exclusive SmartFit System for incredible arch and ankle support. Reinforced heel and toe for durability. 1 x 1 double ribbed cuffs and flat-knit seams increase comfort. Medium cushion. Constructed of 80% New Zealand Zque Merino wool, 19% nylon, and 1% elastic. Made in the USA. Men's Sizes: S (3 - 5.5), M (6 - 8.5), L (9 - 11.5), XL (12 - 14.5).