Just from looking at it, I think the face hugger is just ornamental, and there's a mask underneath that it's attached to from where the elastic attaches. I could be wrong. If I'm not, I don't get it either.
It just looks too tightly coupled to the face (no pun intended, but I'll take it!) compared to a "normal" mask to allow for relatively comfortable breathing. And the face hugger itself doesn't appear to be made of an air-permeable material.

































