clarity, versatility and style - the dragon nfx2 goggle. the swiftlock technology of the nfx2, allows you to change the lenses of the goggle as quickly and securely as never before. especially on days with changing weather conditions, this technology is worth its weight in gold. the frame is airtight with the lens, which also has an anti-fog coating for a clear view.lumalens® dark smokelumalens® technology provides optimised colour and glare protection through an ionised lens coating. the hard coating is scratch resistant and repels dirt, dust, oil and water.transmittance of visible light: 6 %bonus lens lumalens® violetthe violet lens offers perfect protection in poor visibility. reduces glare, increases contrast and prevents premature eye fatigue in overcast conditions.transmittance of visible light: 62 %