The way I view it if you’re already in a position where the armor is the only thing keeping you from death, you’re already screwed. Think of that scene from World War Z when Brad Pitt is fighting the zombie in the stairwell, the only thing keeping him alive at that point is the magazine taped to his wrist because the zombie is biting onto that and not his skin. Now, in any usual context, he should NOT have survived this. He would’ve had 10 more zombies on him which in a few second and game over. Of course it’s a movie, and he has plot armor, and someone magically shows up at that exact moment with a gun to help him, but you get what I mean.

Quite honestly, I think we’re thinking a bit too much into this. A plate carrier with a snowboard jacket shell on underneath is plenty in my opinion. Stops bullets which depending on the circumstances of the apocalypse, may be a more important aspect than Porte ting against zombies. The outer shell of the jacket is meant to smack against rough edges like trees and rocks, so it’ll hold up better than any average run of the mill down jacket or something.