SmartWool PhD Outdoor Mountaineer Socks 50% Merino Wool, 43% Nylon, 7% Elastane Made in USAof Imported Yarn Flex zone at ankle offers maximum flexibility High-density cushion in heel and toe provide protection and comfort in high impact areas, while flat knit leg accommodates fit of low-volume mountaineering boots 20-30 mmHg graduated compression rating helps post-activity recovery Virtually Seamless toe - Style: SW015046 14" overall height - Sock Height: Over the Calf