These Intex River Run I Inflatable Tubes are designed to fit an adult . and they are perfect for tubing down the river . in the lake or in the pool. The Intex River Run 1 is designed for high-performance fun without the hassle of black rubber tubes that can give you tube rash or that uncomfortable burning sensation in hot weather. The Intex River Run I Inflatable Tube also features a quick-release valve that deflates the tube in less than 60 seconds. Its separate air chamber for its back rest lets you set the firmness just the way you like it. Tubing veterans . as well as new tubers will love the Intex River Run I Inflatable Tube.