Kcdude
Adventurer
I have one on the way. Basically it is a 3/8" thick mesh weave that won't compress. It adds a bit of airflow under the mattress to reduce condensation collection, but more importantly keeps the moisture from direct contact with the cloth matress covering. And it is at least half the price of Hypervent or similar materials. Here is another discussion using Keene driwall screen as a moisture barrier ($120 option).
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