The Mares 3mm Classic Socks are made from a durable nylon II neoprene rubber with glued and sewn seams for strength and added durability. These socks are great for use with snorkeling fins to protect your feet against abrasion. The Mares Classic Socks can also be used under primary boots when diving in extremely cold water for added insulation by layering. The socks extra-long designed neck makes them easy to don and doff. The socks are black in color and available in multiple sizes.