Wigwam socks combine natural and synthetic fibers to keep feet dry,warm and comfortable. Hot, cold, wet, dry; the always changing environment requires outdoor socks designed to tame the elements. Size: Mens and Womens. Content: 60% Merino Wool, 4 Channel Polyester, 18%Nylon,2% Lycra Spandex for stretch and resiliency.Sizes M,L,XL