These are very nice sunglasses.  I got them on a flash deal, so I took a chance.  I'm glad I did.  I used to wear Serengeti Drivers by Corning Optics.  VERY expensive but great glasses.  The Serengeti Drivers darken in bright light and lighten when it's darker outside, but these glasses do not.  However, they are just as nice for driving as the Serengeti Drivers and about 1/5 the price!  Great for overcast and slightly hazy or foggy days.  They bring out detail and sharpness and the copper/brown lenses block some blue light giving you a more "easy on the eye" view of the world.  It's why airline pilots loved Serengeti Drivers.  Not great glasses for the beach or on very bright days, but for driving in most daytime conditions, they are superb.