Could someone please tell me if these alternatives can also protect one against being infected by COVID-19 virus, when being outside (in grocery stores, markets, etc)?
If yes, how much of protection will they provide?
A professional face-mask-respirator can give us 99.97% of protection, what percentage can give us the other alternatives like the ones shown below?
Or if you know about other alternatives to protect oneself from getting infected when being outside, please share them.
Thanks in advance