Get the indoor cover. It 'breathes'. So you can and should leave the windows cracked an inch and then cover the car to let the leather 'breathe' and prevent moisture buildup. The outdoor cover doesn't 'breathe' because it needs to be weatherproof. If you have the option, always go for the indoor cover.

 

I don't think that the outdoor cover is thicker, and it's not padded. I think the main distinction is that it is water repellant and reflects the sun, thus keeping the car cooler (theoretically), and is designed with straps and buckle to keep it from blowing off should it be windy.

 

Pelican has a good overview of what you can find for car covers.
http://www.pelicanparts.com/catalog/...over_start.htm


I really don't recommend car covers for anything outdoors. You absolutely will scratch your car with even the most expensive cover. The wind blows stuff under there, and then it just rubs it back and forth like sandpaper. The cover itself will start to wear away the paint.

Indoors is more safe as long as you are gentle and you have a clean car.

 

Agree that one should never put a cover on a dirty car. No cover needed in the garage. Outdoors, on the very rare occasions I drive my 997 to work, I hate the idea of it baking in the sun subject to all kinds of debris, so I cover it.

 

The car covers that we sell are made by the same company that makes them for Porsche.
It is the same quality and fitment.
We offer them in more colors than just the white/yellow from Porsche :-) .

https://www.facebook.com/carcovers.Carnewal/