[BlameKaneda]

New business idea: Wearable that sends out a shockwave if the user gets attacked. The user could adjust its sensitivity, i.e. if they're attacked from a certain angle or they're hit with a certain amount of force.

I'm mostly kidding, but if you're attacked from an unsuspecting angle then no amount of armaments will protect you from that first punch.

[spywaregorilla]

So armor, basically, repelling the fist with the good old normal force.