White Dupont Tyvek by Covercraft works best for me. Lots of humidity here, and eventually moisture condenses in between cover and the car. And then the hot sun comes out and causes the other types of material to cook and chemically bond to the vehicle finish.
About 4 years ago I had a $400 cover (can't remember the brand but it was 2 ply), after about 6 months, it stuck to a black Mercedes that I had. Big mess, had to peal it off. It left the weave pattern all over the upper surfaces. Clay bar did not work, and I had to power buff out the whole car.
Tyvek only lasts me about two years or so, and then it disintegrates, or the Kona winds whip it around, and I have to replace it. But, it does not scratch, drys quickly, and the white color stays cooler than a darker color like gray or blue. Don't know how it works for folks that live in a temperate zone (gets below 70 degrees outside), might freeze to the vehicle also, but I do not have that problem. Just ordered a custom cut one for my black 05 SRT-10. Takes about 30 days for delivery.
I just ordered my second one from California Car Covers.... I really liked the first one and it was a good price. I went with the dusttop that keeps out all dust, considering they will always be stored indoors. Plus the embroidery looks great!
California Car Cover and Big Sky Car Cover sell pretty much the same materials/produts, but they may refer to it different. Just search around and ask a few questions to get the best price. I recently purchased two outdoor covers for my SRT from Big Sky. Here's their phone #:
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