Esty is unfortunately being abused to peddle what is effectively a 5 year olds "I'm not touching you" response to mask requirements.
The issue is that buyers know they're useless against Covid and buy them to thumb their nose at mask requirements.
Bottom line? Cover your face. Overall, research shows that two layers of anything are better than one and that fit matters — no face covering will be effective if it’s not snug on your face."
It is really a shame how some fields (cold fusion, climate change, now it is anything related to coronaviruses) are so loaded that one cannot published a their research without worrying about how it will be misconstrued by the public
This experiment was discussed many times. There were several flaws in the analysis.
After getting my first buff, I noticed that I failed the "blow test" (blowing out a candle with your mask on) when I used a single layer of the buff but _barely_ passed when I folded it over itself. However, the Buff was quite uncomfortable when I did this, so I looked into getting a proper cloth mask. As it happens, the cloth mask is more comfortable and WAY more effective at filtration!
I now use the Buffs on my head when I work out. They're great at absorbing sweat; not as great for preventing the spread of coronavirus.
Unfortunately, football coaches and players still use gaiters on the field (at least the ones I've seen when I've seen games at bars and stuff).
https://medical.mit.edu/covid-19-updates/2020/08/how-do-i-ch...