These glasses actually stay on your face!  I own a part of Oakley Servos and they work well if you don't plan on moving your head.  I can bend over and these glasses will not move.  I can be outside sweating like crazy and they won't fall down my nose.  Warning: the picture of these glasses is A LOT lighter than what I received.  The color is titled root beer but I would call it a very dark brown.  Outside in the sunlight you can see that they are actually brown, but in doors they look almost black.