Wow, those are the best masks I've seen, and such gorgeous fabric.
Rachy, my son who works in a biology lab is having the multiple-mask-a-day problem. Additionally, he has a 55 minute walk each way, to avoid public transportation and as it gets hotter, the masks get soggier. They use disposables in the lab, and I'm encouraging him to have at least 2 masks for the walk home, for comfort, and I think cloth is better for that purpose. I cannot imagine having to wear the mask non-stop for 8 hours. But if you have to, Carla's are the ticket!!