Muck Men's Heavyweight Merino Wool Over-the-Calf Boot Socks - Brown/Green - 2-Pack Contents: 43% Merino Wool, 45% Polyester, 10% Nylon, 2% Spandex Heavyweight with full cushion leg and foot for ultimate comfort High quality merino wool offer superior moisture control and warmth keeping socks and feet dry Stay up leg and top to provide secure and comfortable fit Arch support for added fit with reinforced heel and toe for added durability in high wear areas for long lasting sock life Muck Boot Company Men's Heavyweight Merino Wool Over-the-Calf Boot Socks - Brown/Green - 2-Pack