Look at that fabric, not the holes between the threads. Every one of hose holes is an open airplane hangar door to a virus particle. When the mask gets wet from condensation (which happens in about 5 minutes), transport through those holes is facilitated by the moisture.
What they will do is remind you not to stick your fingers in your face while you are out and until you can wash your hands. They are useless as protective equipment.
I'm sorry to rain so hard on your parade, but that's why hospitals don't use them, even in an emergency. They aren't just useless, when they're wet they can be counterproductive.