Our lightest, thinnest, waterproof sock. An ankle-length, fully breathable sock, with Hydrostop(TM). 100% waterproof, our lighter socks are perfect for running, hiking or any activity. The Aquasealz(TM) membrane releases body-generated heat and moisture, while denying the entry of water. Natural bamboo lining has strong moisture-wicking properties. Hydrostop(TM) prevents water trickling down leg into top of sock.