Oakley m2 frame xl sapphire prizm sunglassesthe latest evolution of the m2, the oakley m2 frame xl sapphire prizm sunglasses enhance vertical dimension. The glasses have a special design that allows you to tilt your head downwards without losing sight of the things that matter ndash greater for cycling.the xl version of the sunglasses have a slightly taller design that also enhances performance in sports and activities where things above need careful attention.lens specificationslight transmission 12%light conditions bright lightcontrast increasedbase lens colour greyfeatureslightweight o mattertrade frame material with ellipse metal icon accentsunobtainiumreg earsocks and nosepads increase grip with perspirationoakley performance shield lens technology with hdoreginterchangeable lens system optimise performance in any environment additional lenses sold separatelyprizmtrade lens technology enhance colour and contrast, allowing you to see in far more detailbuy oakley sunglasses from chain reaction cycles, the world's largest online bike store.