The Sealskinz Stanfield Waterproof Extreme Cold Weather Mid Length Sock in Olive is made to perform in freezing conditions. Built with a durable outer, a waterproof and breathable membrane, and a soft merino wool blend interior, it offers warmth, protection, and comfort in the harshest environments. PRODUCT FEATURES Heavyweight waterproof mid-length sock for extreme cold Durable nylon outer with 4-way stretch for a secure fit Aquasealz™ membrane blocks water while allowing moisture vapour to escape Soft merino wool and acrylic inner layer with terry-loop knit for warmth and moisture control Seamless design and elastic ankle support for comfort and stability Insulating micro air pockets enhance warmth in cold conditions Handcrafted in King’s Lynn, Norfolk Outer Layer: 90% Nylon, 10% Elastane Middle Layer: Aquasealz® waterproof membrane Inner Layer: 41% Merino Wool, 41% Acrylic, 14% Polyester, 2% Nylon, 2% Elastane