First of all buy your cover from the manufacturer not a dealer, CoverCraft manufacturers most of the covers sold. California Car Cover is just a dealer, they buy from CoverCraft.
I own a number of covers, some are a flannel type material and some are made from recycled paper. (Evolution) the flannel covers work well indoors but dust goes right through them. The Evolution cover breaths, is water repellent, and dust does not penetrate it. Using a cover outdoors for longer than overnight is not a good idea.
A good solution is to use a soft flannel cover with a painters plastic drop cloth over just the top side of the vehicle , it will breath and the dust will not penetrate the plastic.
For long term storage I have also used a “car bag” that zips closed, the car rolls into the cover and it zips up around the complete car. If you put a couple of buckets of desiccant inside before it is zipped no moisture will accumulate in, under, or on the vehicle. I have stored a couple of vehicles in this manner in a cold environment for a year, the vehicles came out perfect, not even a trace of dust or storage damage.
I have looked at the bubble enclosures but I think the static electricity of the plastic will draw dust and dirt to the outside of the enclosure and it would be difficult to clean it, they may be the answer if it is used in a clean environment, although not inexpensive.
Just my opinions
