Stop shopping and buy this one.
I did a lot of research before deciding to buy this trail cover. Even then I was unsure until it came in and I installed it. It goes on in less than 5 minutes, by your self, and with two people I honestly think that it would take less than a minute. It has elastic straps, pull straps and plastic strips for the belt rails on the side window area to hold it tightly in place. It also comes with a carry bag. Sat over night with a small pool of water on top after a rain and no seepage.
Not bad, but...
We have two Pontiac G8's. I bought this and a CarCapsule. The materials in the Maxpider are good, but not as good as the CarCapsule. They set up the same, taking the same time to set up and inflate. Both work as advertised. The price is close to the same. If I bought another car storage system, it would be the CarCapsule.