Cressi ANTI-SLIP NEOPRENE SOCKS, Neoprene Snorkeling Diving No-Slip Adult Socks - Cressi: Italian Quality Since 1946 Cressi is a REAL diving, snorkeling and swimming Italian brand, since 1946. Made of soft and supple 2.5 mm thickness Elastic-Span Neoprene. They have a speckled Reinforcing and Anti-Slip Coating on the surface: Non-Slip on Wet Surfaces such as Boat Decks and Slipper Ladders. The black Metallite inner lining makes them Easier to Put On. For 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.