"These are single-lined, thin, high stretch neoprene boots. The inner is lined in Metallite so they are easy to put on and take off. The sole has an effective non-slip lining. They can be used with both closed foot fins for greater warmth and protection from scratches and chafing against the skin, as well as with firm-soled boots, by using open-heel fins. The Anti-Slip Neoprene Socks are designed in Italy by Cressi and made in Cambodia. Cressi has been an Italian brand pioneer in scuba diving, snorkeling, and swimming equipment since 1946."