I work in the a somewhat noisy environment; not super loud, just enough background hum from the air system that you have to speak to up to be heard. It also helps mask how loud everybody breathes. I'm always amazed when I'm in the very quiet bathrooms (music would be nice) and I can finally hear some of these dudes breathing. Just the walk to the restroom sounds like it's going to kill them. I don't breathe that hard after a spirited 5k run, and these motherfuckers just walked 80ft in a controlled environment, to the restroom, and sound like they're about to fall over.