The instructions say not to machine-dry the masks, so I hung them up to dry. The four on the left are the new ones. They're slightly larger than the one on the right that I bought a few months back. They're from the same manufacturer, and they've shifted from US-made to Mexico-made-with-US-materials.
As you can see, the one on the right has gotten a bit dingy due to continued use. Even without the fact that it protects large particles from getting far from me, I get the impression that it's reducing larger particulate matter from what I inhale.
Having multiple masks makes it easier for me to put one in to wash while not going without one myself. I wish we could buy one for every member of Westercon 74, but the volume discounts just aren't high enough to make that viable. Although we do hope that the COVID-19 vaccine is broadly distributed and used, so we can safely hold Westercon 74 in person in Tonopah in 2022, we will never criticize people for wearing a face covering in the future, and we hope you will not do so, either.