World-class athletes have driven Oakley to create innovation after innovation, including unbeatable optical clarity. The Flak Jacket takes that to the next level with the latest in performance technology. Maintains sharp, clear vision the Flak Jacket features Hydrophobic, a permanent lens coating that prevents rain and sweat from building up on the lens. It also repels skin oils and other contaminates, so the lens is smudge resistant and easy to keep clean. It even eliminates static electricity, so dirt and dust particles wont cling. Choose the nose pads that give you the best fit two sizes are included with every frame. Like the stem sleeves, theyre made of Unobtainium to increase grip with perspiration. Three-Point Fit optimizes comfort and holds the lenses in precise optical alignment for superior clarity.