This is such a neat set of sunglasses. It comes with  5 interchangeable  lenses. I have never seen sunglasses that offer interchangeable lenses, I think this is such a great idea.  There are the rainbow mirrored finish, a classic black, yellow tinted, clear safety, and  a clear blue tint.  Each of these were delivered in  a plastic wrap so there are no scratches on any of them. The lenses are easy to change.  I like that these are made of unbreakable polycarbonate .
Also included in this is a very nice hard case that zips closed, a cleaning cloth, a sports strap that can be connected to the arms of the glasses,  a rope that can me attached (this is not as thick or tight as the sports strap),  a bag to place the glasses or spare lenses in, and a nest frame insert that I think prescription lenses can be placed in.  I am honestly impressed all that is included in this sunglasses set.  The price point is great an I have not seen anything like this anywhere else.
I have nothing negative to say about these. My husband likes them and uses them on a daily basis.  They are comfortable for him, very light weight and becasue the case is so sturdy and fits everything in it  he just keep it in his work truck.
I did purchase this product at a reduced price in exchange for my honest and unbiased review.

http://www.amazon.com/Kiben-Polarized-Sunglasses