1/ Some prelim observations: When shooting 100 micron water droplets at a strip of Buff-brand neck gaiter (95% polyester, 5% spandex, woven - material is more important than style) at ~1 m/sec, I saw no droplet breakup and no transmission through the mask.
2/ In the image above, I was personally surprised to see that 100,000 droplets actually accumulated into a macroscopic drop that didn't drip through the mask; the wonders of surface tension.
3/ While this isn't the exact conditions nor droplet composition relevant to talking with a mask on, this does show that mask material isn't somehow defying established droplet physics and shearing droplets in an unexpected way.

Further evidence any covering is better than none
4/ Achieving higher droplet velocities required some modifications to the setup; modifications which should be peer-reviewed, so this is possibly the last time I comment publicly on #GaiterGate while moving towards a mechanistic understanding of physics at droplet-mask interfaces
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