Seatbelts fastened? Climb on board on the Airstream and be prepared for a bumpy flight. This is one of our top sellers and for good reason. The Airstream has been manufactured with a 840 denier nylon cover, which makes the Airstream stronger than most competitors. Its well-thought out form gives users a lively, energetic feeling and makes them literally fly over the water. A one way valve and quick connector make this tube super user friendly.