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
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
