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Even if the inner liner blocks moisture, air always has some humidity. My concern is that body heat would warm up the foam and liner and then a little bit of moisture would condense when the product cooled back down.
Okay, I was able to reach someone in customer service, and they said that in the 8 years that we have been in business, there has never been a problem with moisture build-up or mold. First, the microfiber cover is thick, which already prevents a level of moisture from getting through. Second, the inner nylon cover is meant to trap any other moisture from getting through. Unless you are submerging the pieces in water or spraying them with a hose, you will not have a problem!
I hope this answers your question.