Allow me to ask a stupid question here. Will "iron vest" be able to allow your head to take a full blow? I just hate to see that someone spends 20 years training in iron vest, oneday his opponent just knocks him out by punching to the face.
I can see the value to make your arms and legs tough because you will need to use it to block punches and kicks. But if you can't make your head tough, I just don't see the value to make your body tough.
A solid steel cup with a glass handler just don't make sense IMO.