Straps that can be used when you get your Aerovault with the Track option described below are these Over the Wheel straps. They connect to the track immediately behind and in front of the wheel of your vehicle. The strap then extends down the track for the ratchet to tighten it down. Not shown are rubber pads on the strap that go on top of your tires to guarantee a solid grip. The kit comes with four over the wheel straps and their track connectors plus a handy storage bag.