Best outdoor car cover?

I have a California Car Cover for both my cars. Mine spends time outside as well:

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I use the Wolf car cover. I've heard alot of companies buy these covers and "rebadge" them to their name and tack on some money. No proof on that though, just what i've heard, but they are resonably priced and all my cars basically are outside vehicles. They all have a Wolf cover on them and they haven't let me down yet. Cars stay clean, covers stay on, they haven't ripped at all. Also they haven't caused any scratches on the vehicles at all.
 
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