Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable. 8.5" overall height, 2x1 ribbed welt, 1x1 ribbed leg. * 68% Merino Wool, 29% Nylon, 3% Elastane, washer and dryer friendly * 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)