Copper Lenses are Versatile
The copper lenses take some getting used to if, like me, you typically wear sunglasses with gray lenses. The way they add a rosy tint to everything is a little off-putting at first, but I definitely get used to it after awhile. I like to use these when mountain biking. The gray lenses can't be beat in extremely bright sunlight, but the copper lenses do well enough in bright sunlight and are much better in the varying light levels as you bike in and out of shadows. They also provide more contrast on cloudy days.