The Oakley OO9008 Flak Jacket Sunglasses frame is semi-rimless with interchangeable lenses which can be changed in seconds to optimize vision in any sport environment.  Two different sized nose pieces are included and like the stem sleeves are made of Unobtainium® to increase grip when in contact with perspiration. The frame itself is made from Oakley's lightweight stress-resistant O Matter® frame material and the lenses are made from Plutonite®, a lens material that filters out 100% of UV rays. The Oakley OO9008 Sunglasses Flak Jacket is available from Designer Glasses in frame size 63x20