News

That's not true. The protection works both ways, and it's hard to see how anyone could logically argue otherwise. If it stops virons getting out, it also stops them getting in.

You do have a lot more protection if everyone around you is also wearing a mask because if you're stopping, say, 90% of virons and they're stopping 90% of virons, then both of you will only be exposed to 1% of the virons around (instead of 10% for one-way masking).