The Cressi Hunter socks are single-lined, high stretch 3mm Neoprene socks. The inside of the sock is lined in Metallite, which makes them extremely easy to slide on and off. 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.