What's Inside 3M N95 Respirator Masks? Find Out!

I, admittedly, haven't seen masks with exhaust valves in them yet. Interesting.

The video maker takes apart an N95 mask, exploring each level but apparently not looking into any research separately from what he sees under his microscope.

The first layer is polypropylene fibers, seemingly spun-bonded like Tyvek.

Then there's a thicker, rigid layer of also 'randomly' laid fibers. He doesn't tell us what that layer is made of. The layer is repeated.

He mentions - almost in passing - that the mask is electrostatically treated to help trap particles.

The final layer, the one against your face, is made of a mixture of small and large polypropylene fibers.

I do wish he went into a little more details of what the material in the middle layers is, how each layer contributes to the overall function of the mask, and how each layer's material is made. But, it's the best 'what's in an N95 mask' video I've found yet. Thanks to Material Science Girl for the tip on this video.