From Iron Man's Iron Manual Page 2:

This old head was molded to a likeness of my head, but was not flexible. I found I couIdn't puff out my cheeks or breathe hard — why, I couIdn't even shout because there was nowhere for my jaw to go. Things are sure different today, flexible and a whole lot more comfortable. I find that the micro chain mail structure allows my expressions to slightly distort the surface making the ‘face' more human. Which I like.

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