Anon Optics offers an extensive selection of spare goggle lenses in various tints for adapting the men’s Anon M4 Goggle to any weather condition. The M4 goggle is unique in that it is the world’s first goggle compatible with both cylindrical and toric lenses. This spare lens features toric technology which mimics the curvature of the eye for superior optics, enhanced peripheral vision, and maximized venting for fog-free vision. SONAR by ZEISS technology in this lens means ultimate contrast and clarity, giving you the best possible definition and terrain recognition so you can see more accurately on snow. All Anon lenses feature Integral Clarity Technology anti-fog treatment for crystal clear vision in any condition.- Includes Anon M4 Lens Case- Anon Toric Lens Technology: Toric Lens Technology combines de-centered technology with lens curvature that mimics the curvature of the human eye for superior optics while also providing enhanced peripheral vision and maximizing the possible vent volume in the goggle.- Magna-Tech® - M4: M2 Magna-Tech™ integrates 16 rare-earth magnets into the carrier liner for eight points of connection, each with a pull force of 2.75 lb. (total retention=22 lb.). Features unsurpassed retention, coupled with best-in-class self-aligning engagement.- ICT (Integral Clarity Technology): Anon ICT (Integral Clarity Technology) anti-fog treatment delivers crystal clear vision, no matter what the elements throw at you. The porous cellulose inner lens surface coupled with our chemically etched ICT anti-fog treatment provides superior moisture shedding and longlasting clarity above and beyond standard acetate lenses. ICT works in tandem with full perimeter channel venting to evacuate warm, moist air from the lens area.- VLT (Visible Light Transmission): Anon offers a wide range of lens tints, covering the entire VLT (Visible Light Transmission) spectrum, from whiteout to bluebird conditions. Clear to mirrored Anon Solex™ lenses offer superior vision in all varieties of light. BLUEBIRD TINTS (6-29% VLT): Allows 6-29% of the sun’s light through the lens to your eye, providing optimal vision on bluebird/sunny days. PARTLY CLOUDY TINTS (30-54% VLT): Allows 30-54% of the sun’s light through the lens to your eye, providing optimal vision on partly cloudy days. GREYBIRD TINTS (55-85% VLT): Allows 55-85% of the sun’s light through the lens to your eye, providing optimal vision on cloudy/gray days.- TRU-V™ Polycarbonate Lens: All Anon lenses offer 100% UV protection and exceed ANSI Z87.1 impact test standards.- Sonar Lens Technology by Zeiss: Exclusively developed for snow sports by Anon and ZEISS, the NEW SONAR lens increases depth perception and enhances contrast for the best possible definition while retaining true world colors.