I have a cabrioshield. It’s fit is very snug. It is fastened in between the door and the chassis both between the front wing and door and the rear wing and door. And then you also fasten it between your trunk lid and body work. This means noone on the street can remove your cover except when they destroy it. The material of the parts that sit in between is thick, if it is even possible to rip it by hand you’d really have to use excessive force. This makes it harder to break into the car, let alone viewing inside to see what’s in there. So makes your car a lot more break in proof.
The material of the cover itself is also very sturdy and thick. I really like this cover. They also have a breathing version for prolonged use.