Livre d'Or

I'm not sure the evidence is even really clear for that - certainly not if we discount the notorious TRT '89 study.

The things are engineered down to the standards to make them light and breathable, and the standards specify something about 1/8 as robust as the average skull. It might _feel_ akin to wearing a bulletproof vest, but it's more like putting a cigar case in your top pocket and hoping.