Here is what I found online and copied and pasted below:
Water is one of an RV’s enemies, specifically when it’s trapped under a tarp. If condensation collects below the cover and can’t escape, it provides a breeding ground for mold and mildew. In more extreme temperatures, it can lead to freezing and cracking around the roof.
Most good RV covers will be waterproof, yet breathable. Small pores in the fabric allow moisture to evaporate without allowing water droplets in.
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2019 Cougar 361RLW
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