Sealskinz Unisex Mid Weight Knee Length Comfort Sock Nylon / Elastane Mid weight, knee length sock, perfect for a multitude of activities & conditions, with added coverage Totally waterproof, breathable and windproof Merino wool lining for moisture control & comfort Elasticated ankle & insteps offer support and a comfortable fit Material composition: 91% Nylon, 9% Elastane; Hydrophilic Membrane; 35% Merino Wool, 34% Acrylic, 28% Polyester, 2% Elastodiene, 1% Elastane