It is NOT a good idea to fly without wearing a mask

[Ms. Toad]

55. Sorry - I forgot to come back and add the link.

Here it is: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7185834/

Table 1 has the comparison information. The middle column is the .3 micron filtration percentage (N95s block 95% or more of particles which are .3 microns are larger). Rows 9, 10, 16, and 17 are the rows on tight weave/multiple fabric masks.

As to what is recommended as "best," that depends on who you listen to. N95 and KF94 are universally considered to provide good protection, as long as they fit well and aren't counterfeit. When I wear disposable ones, I wear a KF94 - because of how Korea certifies its masks they are somewhat less likely to be counterfeit. Cloth masks don't fall in the most recommended list for anyone for two reasons - most people are unaware of the studies done and there isn't any standard certification for cloth masks. I wouldn't rely on a store-bought mask to have the correct number of threads per inch, but the ones I have now rely on the electrostatic filtration from the different fabrics as opposed to the size of the holes. (Incidentally - that's why your N95 mask breathes more easily than some other versions - all of the KF94/N95 masks rely on electrostatic filtration rather than size of hole, which means they breathe more easily than cloths relying on multiple layers and tight weave - which inherently restricts air flow more.)