With full, plush cushioning, the Classic Mountaineer Maximum Cushion Crew sock is just right for your long-distance and backpacking hikes. Its elasticized arch brace offers secure, lasting fit, and its flat knit toe seam helps with in-shoe comfort. Smartwools&'; thickest, warmest sock, this wool crew helps ensure that your feet stay comfortable, no matter how long the hike. Features Sock Height: Crew Smartwool&';s first sock construction, only now featuring recycled nylon (content varies by style) SmartWool&';s thickest, warmest sock Elasticized arch brace for secure fit Flat knit toe seam for additional comfort Made in the USA of Imported Yarn: 74% Merino Wool 8% Nylon 17% Recycled Nylon 1% Elastane