Understanding Ballistic Rating (Z87+)

Yo, safety glasses. They got to be the ugliest things you'll ever wear, but man, these things look super rad. So, check this out. So, these are really Are these safety glasses? >> They are. They're all Z87 plus. So, ballistic rated. >> So, ballistic rated. So, >> I mean, they actually take a gun to these and to test it. That's what they do. >> That's real. That's real. Yeah. All right. So, you notice that there is no venting on the front of it. The venting is all at the top. Um, and the reason why is if you have venting on the front,