The Airhead Inflatable Towable Tube - Viper 1 has a boat hull shaped bottom which is the key to the unparalleled lively and stable ride. VIPER inflatable tubes are perfect for young children who need a more secure ride or are new to water sports. The durable 30 guage bladders are completely encased in durable double-stitched nylon and the striped nylon wrap handles have neoprene knuckle guards for comfort.