Bolle vigilante does the job of three different sunglasses (or more) - Bolle Vigilante Sunglasses with Interchangeable Lenses

If you are a utilitarian, you will love the ability to use these glasses with a different lens for all your activities. I use a dark gray or light gray for flying, I use the tennis optic for tennis, light or dark brown for golf. For driving, biking, hiking and just walking around, I pick the lens based on the sun and cloud conditions. I bought extra lenses so I now have at least 7 different lenses and I use them all. The alternative is to own three or four different sunglasses and that's even a compromise with my setup I can choose between a light or a dark brown, not just a brown lens. Ok so they aren't as stylish as gucci or prada but UTILITARIAN baby.
Pros: Interchangeable lenses for every condition
Cons: Takes some getting used to changing lenses quickly

This review was written in the old system and had content requirements that are different than reviews written today.