Waterproof B1 1.5mm Socks Pair of Waterproof B1 1.5mm Socks Durable Nylon II Neoprene Rubber Sewn Seams for Strength and Added Durability Great for Use with Snorkeling Fins to Protect-your-Feet Against Abrasion Layering: Use Under Primary Boots in Extremely Cold Water for Added Insulation