Anon Optics offers an extensive selection of spare goggle lenses in various tints for adapting the Anon Sync Goggle to any weather condition. 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.Anon Sync Sonar Lens Features:   Anon Cylindrical Lens Technology ICT (Integral Clarity Technology) SONAR by ZEISS technology M-Fusion Magnetic Assisted Lens Change Technology Wall-to-Wall Vision Vented Double Layer Lens