I can comfortably wear these for my entire seven hour shift. It has enough room for breathing without the mask entering your mouth when you inhale. It sits perfectly on my face without gaps. No creative sewing required. I can speak to customers without the mask riding down. I bought an additional three, and I'll probably buy three more next paycheck. 10/10 would recommend.
Very good quality. One of the larger ones we have gotten and the nose piece that conforms to your face is very nice especially when you wear glasses. Am going to order 2 more sets at least. Maybe more.