Bought the Kaenon Hard Kore sunglasses mainly for running. These are lightweight and have crystal clear lenses. The frames block the light from the side very well. I also like the fact there is no frame on the bottom of the lenses. This really opens up the field of view. I have the C12 lenses and find them a nice all-purpose lens. I had the C28 lenses and found they were not quite dark enough in normal sunny conditions. Would also recommend these glasses for biking, golf, or pretty much any sports activity.