Airhead AHVI-F2 Airhead Viper Double Rider Towable Tube AIRHEADs VIPER series is a collection of cock-pit style towable tubes. The boat hull shaped bottom 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 gauge bladders are completely encased in durable double-stitched nylon and the striped nylon wrap handles have neoprene knuckle guards for comfort.