How hard is a harness driver's helmet?

[Sweet]

Let's use me as a test dummy, that should be an easy visual   

A .22 up close to the back of it, a .30-06 from a distance

A hard strike with a samurai sword or toilet bowl cover to the top of it

I flew up 10 feet from the sulky and landed on it

How is this thing holding up...on me?   

[seriously]

It must be incredibly strong as it is charged with protecting some of the most precious cargo....a harness driver's brain!   Now that is a national treasure.  An 8th Wonder.   

 

[Sweet]

It must be incredibly strong as it is charged with protecting some of the most precious cargo....a harness driver's brain!   Now that is a national treasure.  An 8th Wonder.   

 

 

What's the 7th wonder of the world on that planet, a burrito