This is simply not True. The WindS is covered with Oracover, which is one of the best coverings money can buy.

The only thing you have to do, is iron it once with a sufficient temperature to let it shrink.

I sometimes fly after work and then the WindS is sitting in the car all day while I work. Our parking has no shade and temperatures can rise above 50 degrees celcius in the car and it's sitting in direct sunlight. The first time I did that, it wrinkled. I ironed it once, and have had no problems since then.

Really, if it wrinkles in your situation, then any other brand would have wrinkled more.. Oracover is top-noth covering..