With Kwik Tek's Airhead Sidewinder ($89.99), you can turn a one-person towable into a two-, three- or four-person towable in a matter of minutes. With this versatile new model, you can connect up to four tubes together, which snake through the water like a train while sliding independently. It's simple to link them together - just connect the Kwik-Connect up front to the integrated rope loop at the rear. A Boston valve is provided for convenient inflating and deflating of this 63-inch-by-50-inch cockpit-style tube.