It's not the sort of membrane that only works when air is flowing in one direction. It won't protect you from getting goober in your eyes, but when it comes to

It's not the sort of membrane that only works when air is flowing in one direction. It won't protect you from getting goober in your eyes, but when it comes to inhalation, N95 material is great. It also helps that N95 masks tend to have better nosewires for fit, and specify real head straps, which makes them practically more dependable than some masks like most KF94s.