Info on Amazon in ad says no fogging and a strong nose clip. None there nor so I read ever have been so reviews implies. Poor service from Amazon should have fixed ad ages ago. Too big for wife gap under chin.
Added my own nose wire and then realized that 2 of the masks are so thick to not allow passage of air so when the wire is bent to hug the nose a breathe in sucks all the air out of the mask and the mask into your mouth. The other two are the opposite they pass air very easily and seem thin. If I could afford to waste those I would cut them up and post a pic they seem 3 layers only. Reviews appears to hint at this as well.
The thick 2 are not usable as a mask as all air comes in the nose area defeating the filtering idea of a mask.