The Classic Mountaineer Mens Maximum Cushion Crew Socks from Smartwool are the perfect hiking essential. The full cushioned sock gives your maximum support and comfort. The elastic arch gives a foot hugging effect that is long lasting. The thick sock will keep your feet warm in the coldest of weather. Take on long-distance and backpacking hikes with these socks. They feature full plush cushioning for maximum comfort, while the elasticized arch brace provides a secure and lasting fit. The flat knit toe seam ensures in-shoe comfort. Made from wool, this is our thickest and warmest sock, perfect for keeping your feet comfortable during cold-weather hikes. Our first sock construction, only now featuring recycled nylon (content varies by style). Our thickest, warmest sock. Elasticized arch brace for secure fit. Flat knit toe seam for additional comfort. Weight: 0.348 lbs. Country of Manufacture: Italy. 69% Wool 30% Nylon 1% Elastane. Small: UK 2-4.5, Medium: UK 5-7.5, Large: UK 8-10.5, Extra Large: UK 11-13.5. Merino wool helps manage moisture, regulate temperature, and resist odors.