Saelune said:
Super suit and life-long training. He doesnt have super-natural powers, but Vibranium which the suit is made out of, is basically the most powerful physical material in Marvel, even more so than Adamantium since it has special properties. Captain America's shield is made of it too.
Edit: I guess the film doesnt really tell you anything about his suit or Vibranium.
I suppose it depends on whether MCU Vibranium works like its comic counterpart.
In the comics, Vibranium absorbs all vibrations and kinetic energy directed at it, storing that energy between the molecular bonds. In short, the more you hit it, the tougher it becomes. But there are limits to that. It can be destroyed by a force greater than its ability to absord, though how much that is depends from writer to writer.
Adamantium, once cooled, is usually stated as being completely indestructible to anything short of other adamantium in the main Marvel comic continuity. It doesn't seem to exist in the MCU though, with Vibranium replacing it. I assume that's because Adamantium is more closely related to Wolverine and the X-Men, and 20th Century Fox owns their movie rights.
And then there's Uru, the metal Mjolnir is made of. It's generally shown as being near indestructible too and capable of defeating any other material, save for Vibranium and Adamantium. I don't think it's been mentioned in the MCU so far.