Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable. 3.75" overall height, alternating 1x1 welt, single layer 1x1 ribbed top * 52% Merino Wool, 44% Nylon, 4% Elastane, washer and dryer friendly * Women"s sock sizes Small (shoe size 4-6.5) Medium (shoe size 7-9.5) Large (shoe size 10-12.5) NOTE Women"s size Small fits Youth shoe size 2-4.5)