The material is called Dyneema, which is an ultra high molecular weight polyethylene.

I’ve seen high strength polyethylene used for bullet proof garments and butcher’s gloves, where it has a real advantage over Kevlar® in that it does not degrade in a washing machine.

They were showing at a show what happened when a 500g high speed (about 1500 m/s) projectile at it.

It looks like the projectile had a low sectional density, but it’s still impressive.

Here is a test stand with penetration of multiple layers:

With the detail of the final layer stopping the projectile:

Definately neat.