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I have two covers; one is a Wolf and the other is a California Car Cover. Both are great covers and fit the car like a glove.
I tend to use the California Car Cover more as it is a little lighter and works just fine in the garage. The Wolf is better suited if the car was ever outside and needing to be covered which has only happened a couple of times while on a trip.
The best indoor and outdoor cover is the NOAH material availble from Wolf through most distributers. I bought one for my Z and found it to be kind of stiff and heavy for indoor only use.
I ended up selling it and, after doing research, bought a "duststopper" also from Wolf. This is indoor only. It's still pretty bulky which gives you good resistance if someone bumps the car in the garage, is flexible enough that it goes on and off easily, and rolls up and fits in the trunk w/o a big deal. Both the Duststopper and NOAH are both hi-tech waffle weaves.
For indoor you can go to the real thin $40 covers, but they offer just about zero protection.
For indoor use, with some protection from bumps, I recommend the Duststopper.
I just bought a Wolf Noah, I was not too impressed when I got it, for a 4 layer fabric it seems pretty light and thin, I got the custom one with the pockets for the mirrors, the fit is good anyway.