I liked this article that commented on the recent mask study as a counterpoint...
"It's unclear to me whether they actually measured respiratory droplets," said William Ristenpart, a professor of chemical engineering at the University of California, Davis who was not part of the study. Instead, the Duke team may have measured dustlike particles of fabric that came from the masks. "Research from my group in peer review right now indicates that some fabrics shed substantial numbers of particulates that confound mask efficacy measurements," Ristenpart told Live Science.
https://www.livescience.com/coronavi...k-gaiters.html