Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable. 3.75" overall height, double layer 1x1 ribbed welt * 69% Merino Wool, 29% Nylon, 2% 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)