Swirl marks scratches are not from the cover it is from dust or dirt on the paint and the cover moving by way of the wind. I keep my car in a large locker, no wind but dust so a cover that goes all the way to the floor and is tight on the ends keep the car very clean.
joules"Racing is Life, anything before or after is just waiting" - Steve McQueen
Here's my experience with covers;
Indoors a flannel cover is best, fit isn't as important, but the better it fits the happier I am as it prevents any movement.
A generic cover outside is a waste of time, the only covers I've had success with are the ones that are flannel lined, breathable and a snug (designed) fit. Everything else blows off or leaves marks on the car, it's critical it fits with no room for movement.
The dealer supplied ones have been good, a California Car Cover I purchased for a Mustang to fit on a Mustang was terrible.
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