For guys.
I assume you mean sunglasses? there’s no real fashion, it depends what suits ur face
like this style suits round faces
](http://www.mensflair.com/media/buyers-guide-sunglasses-michael-kors.jpg)
but aviators on a round face just look wrong. also make sure you get a good shade… grey works well on most people. just don’t get those blue blocker ski type sunglasses!!!