I needed ballistic glasses for the range that have some shatter resistance. I misplaced a spare set, and needed them sooner than later for a friend. I start looking on Amazon. One of the top results at the time for Z87+[0] was a pack of 3 or 5 glasses for about $8 USD, and it hit me that there is a good chance these small companies are slapping ANSI and MIL-PRF tags onto their products. (Edit: I did the search again today. That listing does not show when searching "Z87+")

In all my years, I've never needed the shatter resistance offered by ballistic glasses. Think about how unfortunate it would be to find out on the range that your safety gear is a pair of $2 plastic lenses.

[0]: https://en.wikipedia.org/wiki/Ballistic_eyewear#Performance_...