The Waterproof B1, 1.5mm Socks are made from a durable nylon-2 neoprene rubber with sewn seams for strength and added durability. These socks are great for use with snorkeling fins to protect your feet against abrasion from the fins foot pocket. The B1 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 Waterproof B1 Socks are black in color, and available in multiple sizes.