If you look at Iron Man's first suit, the Mark 1, and compare it to the hero's nanotech suit from "Avengers: Infinity War" and "Avengers: Endgame," a lot has changed, but it's not just the technology ...

This all black version of Tony’s classic suit doesn’t pack any additional firepower, but that’s because it was made to be the ultimate armor dedicated to survivability. This suit debuted in Iron Man ...