Seems like they took normal glasses and sprayed them with reflective paint.  Not only are the glasses very difficult to see out of, they constantly make your eyes strain even on a sunny day.  I typically buy $5 sunglasses from Walmart so I don't exactly have high standards when it comes to sunglasses.  But none of those $5 sunglasses ever made my eyes hurt like these do.  I think it's because instead of tinting the light, the paint is actually blocking it from entering the lens (not in a good way, like polarized lenses) causing your eye to constantly strain just to see.  Wearing them becomes painful very quickly which is a pity because they look very cool.  I agree with another reviewer, inexpensive but useless.