@Freedom2B @Pat

These are called electrets. Tiny dipoles with positive and negative ends.

N95s only, not medical/surgical

Evidence on silk didn't pass muster and that's why we don't include it.

Here's an evidence based summary on materials for cloth masks⬇️

https://maskevidence.org/summary-of-advice

And here's our paper on cotton⬇️

https://pubmed.ncbi.nlm.nih.gov/35316263/