Has anyone found a comfortable face mask?

[rgG]

Marc Anthony wrote:
I just got this shemagh and love it. It can be folded to cover mouth, mouth/nose, or everything but the eyes.

Something like that would probably be fine in cooler weather, but it is already getting hot here.
I am mostly thinking for if/when I have to go back to work and wear one all day. My customer service attitude might go steadily downhill as the day wears on, and I have to wear the mask.