Just like the ones you get at Dollar General but a buck cheaper.  If you are expecting high quality for $6 you are being dumb.  After learning an expensive lesson (you can't see your car's heads-up display with expensive polarized sunglasses) I ended up getting a non-polarized pair at Dollar General.  They worked great but found that they are also not going to take kindly to being abused so I ended up having to buy another pair.  Hey, they're $7 and one should not have grand expectations.  Anyway, saw these (cheaper and with tortoise shell frames) so ordered them.  Looked them over with the DG brand I had and they are nearly identical.  So, I'm mindful of not abusing them (easily done) and we're good to go.  When they break, and they will, I will just buy another pair.  Very happy with them.