Uppers are made of genuine neoprene and rubber 100% waterproof neoprene-bootie construction with breathable Airmesh Lining Storm-proof natural-rubber shell with protective toe and heel reinforcements DurevaTM outsole - ultra lightweight and durable with grippy Starliner tread Premium fully-moulded removable PU sockliner for all-day comfort and durability Built on a sneaker platform for speed and agility Contoured internal nylon shank for added arch support Easy on/off convenience with 4-way stretch topline openings Fully buoyant even when completely submerged Quick clean-up with soap and water Fits standard athletic shoe sizes - best to fit with a thin running shoe ankle-height or no-show sock