Hanz Submerge Waterproof Socks: Calf-length Nylon/Lycra, Waterproof, Breathable Sealing cuff blocks water from entering at the top of this over-the-calf sock 3-layer fabric prevents water from penetrating while allowing perspiration to escape Durable nylon/Lycra outer and a comfortable, moisture-wicking inner lining Each sock is high-pressure tested to ensure waterproof performance