Take on the worst weather you can find in the Sealskinz Cold Weather Knee-Length Waterproof Socks for Men. These 100% waterproof and windproof socks protect your lower extremities from tough weather. A hydrophilic membrane in these socks' middle layers simultaneously keep water out and pull moisture away from your skin at the molecular level so that you can stay dry and ready to take on the next switchback. The inner layer's merino wool blend insulates and regulates temperature for more warmth in winter. Outer layer: 90% nylon/10% elastane. Middle layer: 100% hydrophilic membrane. Inner layer: 35% merino wool/35% acrylic/23% polyester/3.5% nylon/3.5% elastane. Machine wash. Imported.Manufacturer style #: 11123065010. Outer layer: 90% nylon/10% elastane Middle layer: 100% hydrophilic membrane Inner layer: 35% merino wool/35% acrylic/23% polyester/3.5% nylon/3.5% elastane Waterproof membrane Windproof and breathable Heat-insulating