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Check out the fabric that would not tear under an ice pick.

Actually, it would be possible to penetrate with an icepick, if you did it slowly. It's 'ramming' an icepick through it that the material resists.

That's not a complaint. I think it's an excellent approach. If someone wants to stab you 'slowly' you can usually figure out something to do about it. And that way, it's not stiff until you need it.

What's really interesting about this - to me - is that this sort of limitation is described in Frank Herbert's "Dune." They had force field armor, but the key was that the resistance was proportional to the speed of impact. You could 'shove' a knife through the field, but you couldn't 'ram' it through.

Once again, Science Fiction leads the way for science fact.