The Sealskinz original, 100% waterproof ankle length sock featuring Hydrostop which is the perfect barrier for use in wet and warm wet weather conditions. Waterproof - three layer construction for warmth, durability and waterproofing Comfort - Bamboo lining for moisture control, insulation and comfort Hydrostop - Reduces water ingress Support - zonal elastication for added support Comfort - flat toe seams prevent rubbing MaterialsOuter: 94% Nylon, 6% Elastane Membrane: Aquasealz Inner: 75% Bamboo rayon, 23% Nylon, 2% Elastane