I get about 6 - 7 years out of my WeatherShield HD covers when parked in a somewhat sunny location. Much more in shade. Would get much more life if I replaced the stitching and elastic.The material lets a little bit of water through in heavy rain. It also breathes. As expensive as it is, it is way less than a new paint job. Also, one rarely has to wash the car. I've been using car covers on Z's for about 40 years and have tried many materials. IIRC, I wrote a post here many years ago comparing materials.
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