It also failed to punch through even one side.

We were a little surprised.

It only made a bulge on the inside of the helmet.

How about a round of .45 ACP Ball from my Kimber?

Tman caught the water jug falling, but it wasn't punctured. Again, a big bulge on the inside, but it held.

Let's raise the bar a little.

A round of .357 Magnum, 158 grain JHP, out of my S&W Model 27, with an 8 3/8ths inch barrel.

We expected this one to make it through, but no joy.

Tman caught the helmet in the air, as it bounced a few feet in the air.

But when we checked it...

It didn't penetrate even through one side.

These things are pretty tough.