Dri-Dek | The Product
We only seem to need it on my front bunk where fiberglass is underneath the cushion.
My husband sleeps on the dinette and we have never noticed moisture there. He must not throw off the heat I do. Also, we put the table up every day so cushions get moved around.
I suppose closed cell foam might not have the problem either?
Somewhere I read for tent trailers to put the bubble alum stuff under the mattress (they hang out over air) to stop the condensation.
We have a boat supply place convenient and more convenient they had a close out on a dri-dek type product.