Review (5/5): I hate masks, but this one, I wear.
I have COPD and am very sensitive to heavy particulates in the air. I feel claustrophobic with most masks, and can't stand to wear them. This style, however, is light, comfortable, and I can easily tuck the 'chin' piece under, so my mouth is clear. It's not in the way of the oxygen cannula. I bought one to test, and ended up buying two more. I like the fun and pretty patterns of the microfiber fabric.
They work very well.