The Smartwool Women's Classic Mountaineer Maximum Cushion Crew Sock is an extra thick sock for long days in the mountains. Backpacking is rough on the feet, so wrap your precious in the merino wool blend featuring recycled nylon. The new environmentally focused fabric blend is durable as well as soft and temperature regulating. Plus, plenty of cushion for the long, hard miles ahead. Features of the Smartwool Women's Classic Mountaineer Maximum Cushion Crew Sock Sizing clearly indicated on the sock Flat knit toe seam for additional comfort Fabric Details 74% Merino Wool, 25% Nylon, 1% Elastane