system
Given the following post, respond as if you're commenting on Reddit:
human
[Ironman] What sort of "padding" is within the Ironman suit? When Ironman is beat up or thrown though buildings, how much does it hurt Stark inside?

Basically, what cushions the damage to the user? I'm assuming regardless of the exterior of the armor, the person inside must get banged up a lot if the armor was say throwing through buildings or punched hard.
gpt
He seems to have some form of inertial dampening built into the suit. 

We know from the existence of vibranium that the laws of physics in the MCU are a little wonky, so it's possible that someone who's superpower is engineering skill could figure out a way to exploit something in a way to manipulate the inertia of objects without having an impact on velocity. 

Tony's invention of a practical miniaturized arc reactor is likely what open up the door to this kind of technology in the first place.

Without a way to reconcile his own body's inertia, there's no way he would have even survived up to the ice forming in his first test of his suit.