A word of warning for those with a van or camper.
I bought an ADCO cover for my poptop. I left the van for two to three months under the cover. When I opened the van, I found the rear section was soaked inside. There was mould and destroyed carpet. Furious, I rang the shop I bought the cover from, they checked the ADCO site. Unfortunately they found the cover listed as 'Water Resistant." So no comeback for getting some sort of compensation there.
The cover let rain through, which would dribble down the sides of the van or stay on the roof. When the sun shined, some of the moisture evaporated and condensed in the evening cool. This allowed a bit of moisture to end up inside the van, too.
I have had the van in the shed for months, letting it dry out and have done repairs.
I took the cover to a local canvas shop, and they sewed a new roof on the ADCO. Yet to test that out for being water proof.