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Permeable - (adjective) - cable of being permeated: penetrable; especially: having pores or openings that permit liquids or gases to pass through.

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The face masks that our governments are insisting we wear are allegedly permeable allowing you to breathe.  Let me know how well that works for you after a few hours of wearing one.

for more information - https://www.dictionary.com/browse/permeable?s=t