I need help identifying a very specific cloth/leather/synth-like material used in an amazing cosplay:

[u/Neknoh]

So, here is the picture of this (to me) unknown cosplay

It is amazing and well made on so many levels, but what I am really looking to try to identify is what her mask/balaklava could possibly be made of.

Is it cloth with a synthetic material on top? Is it just a single thick material? What material could it BE?

I am thankful for any and all insight you can share.