It might cost a little more than an expensive race running shoe but you'll go through plenty of lightweight vulcanized rubber racing soles before you'll need to replace Oakley's M Frame Heater Sunglasses--and then all you'll probably want to do is swap out one of the interchangeable lenses. Made for a variety of aerobic sports Oakley's M Frame Heater eyewear offers more lens coverage than other M Frame models so it minimizes peripheral light leakage without blocking your vision. The three-point fit and wraparound peripheral coverage give you 100% UV protection for any activity in any condition while Oakley's patented XYZ Optics® let you take in the polarized glare reduction with complete clarity. Like other Oakley M Frames the M Frame Heater Sunglasses feature interchangeable lenses you can add polarized and non-polarized lenses with varied Visible Light Transmission ratings for exceptional optical clarity in changing weather conditions. If fit matters and you don't want the extended lower lens coverage on these M Frame Heater sunglasses Oakley's M Frame Sweep sunglasses feature the same peripheral coverage with a little less Plutonite lens.