[LT] Why specifics about helmets and neck?

[Polydamas]

I wouldn't allow front/back protection on the arms, hands, groin, or feet. The arms are doubtful ... some manicae only protect the front, but in that case the bottom of the arm can be attacked when you extend your arm to strike or parry.

Originally Posted by Gudiomen

Consider "front" of a hand to be it's external side, and "back" to be it's palm/internal side.

The groin doesn't seem to make sense from the back, but the knees do... for instance, if you want to armor the front of the knee with plate, but the inside of the joint with a leather backing.

That wasn't the intent as far as I know. The given weights include an allowance for armour gaps.