I agree the predators I believe made the masks not only for better vision and protect from projectles and melee combat but also from facehuggers and the alien inner mouth, the mask can stop an armor persing round I'm sure it can stop an inner mouth.

I have to disagree with you there donut, Predator armor is extremly strong, I just think Paul Anderson wanted to see that but logicaly no an alien inner mouth cannon breack through a predator mask, and you just cannot campare the predator mask to army helmets.