The Zeiss Anti-Fog Defender Kit prevents fogging and misting of lenses, the specifically designed cloth is gentle and does not damage the lens coating. The Anti-Fog Kit utilizes an Anti-Fog spray which ensures that fine, condensed water droplets cannot adhere to the lens surface. The Zeiss Anti-Fog Kit can keep your lenses fog-free for up to 72 hours without influencing optical quality.FeaturesPrevents fogging and mistingLenses can stay fog-free for up to 72 hoursSpecifically developed cloth is gentle and does not damage lens coating