The Oakley Radar Ev Path interchangeable lenses provide you with the chance to change lenses. Perfect to use in the UK, since the weather tends to change in a heartbeat. At least with these lenses, you'll be prepared no matter what. It could also be that you just want to change the look of your glasses, in which case you can choose for one of the other standard colours. If you're just looking for protection from wind and rain, then opt for the transparent lens.