Lance Armstrong and Oakley Eyewear collaborate to give you the Oakley Livestrong Flak jacket Sunglasses. These special edition sunglasses feature distortion free High Definition Optics seated in Flak Jacket frames highlighted with Livestrong yellow. The Livestrong sunglasses feature Oakley"s signature precision-tapered XYZ Optics to give you distortion-free vision as you look through the Oakley lens. The existing Flak jacket lenses (sold separately) are easily interchangeable for lighter or darker lenses depending on the lighting conditions of the moment. To keep your Radar sunglasses on your face while you ride your bike or hit the trail, grippy rubber Unobtanium ear socks hug your head to give you a secure yet comfy fit that won"t pinch or cause painful pressure points. Backcountry.com and Oakley will each donate $10 (for a total of $20) from every pair of Livestrong sunglasses sold to the Livestrong Foundation. Because cancer sucks. Product FeaturesFrame: Hinge: Lens: Interchangeable Lens: yesLenses Included: Polarized: noFace Size: mediumFrame Measurements: Case Type: Nose Pads: yes, UnobtaniumTemple Pads: Recommended Use: cycling, casual, boating, golfManufacturer Warranty: 1 year