Before you buy this, let me just let you know what this really is. It's basically a huge, meshy sock with the bottom cut out. It's extremely simple and I felt a bit ripped off at first, but then I learned that its simplicity was a large plus: you can manipulate it into almost any kind of headgear you could want. It allows you to breath, the material quality is decent (it looks like you could easily rip it if you wanted to) and can be used to do anything you want. For an oversized sock, you could definitely get much worse.
+ Simple but effective
+ Can be used to make many kinds of headgear
+ One size fits most
- No instructions (though if you have some time and a brain you can figure out how do to things
- A bit much for an oversized sock (but that's just my opinion)
Overall, good value for your money, you could definitely get worse.