Reusable face masks are made of fabric and can be washed. They are generally used by frontline workers as covers for N95 or surgical masks, or by members of the general public who do not expect to encounter infected persons.
We have two main sources of reusable face masks: our own product in Asia of 100% cotton masks with latex-free head wrap elastic, and commercial donations.
Update August 5: Unfortunately we are out of these masks.