These are single-lined, thin, high stretch Neoprene socks.The inner is lined in Metallite so they are easy to wear. The sole has an effective Non-Slip lining. They can be used with both closed foot fins for greater warmth and to protect the skin from scratches and chafing, as well as with firm-soled boots, using open-heel fins. In this case, warmth is considerably increased and it is also easier to put on your wetsuit. The Anti-Slip Neoprene Socks are designed in Italy by Cressi and made in Cambodia. Cressi has been a real diving, snorkeling and swimming Italian brand since 1946.