Frameless goggles with technical refinements . The Norg is designed for skiers and snowboarders who shred any terrain and want a goggle that works in any weather and condition. The Gravit8™ lens change system makes changing lenses effortless, while 3DPlane™ lens technology provides incredible vision.HiPER® Silver Mirror LensThese lenses filter out certain colour wavelengths to create more contrast. In addition, the High Altitude technology softens the curvature of the lens when pressure is released at high altitudes. The Mirror Silver Lens is perfect for very sunny and bright days.Transmittance of visible light: 8 %Replacement lens HiPER® Pink The included bonus lens is suitable for cloudy to very cloudy days.Transmittance of visible light: 48 %