HOW IT WORKS Our patented KLAIR™ technology places an invisible heat-conductive film between a two-part lens. The battery sends a current through the film to heat the lens and keep fog away all day. It's the most powerful, comfortable, effective technology ever put in a goggle. ACTIVE ANTI-FOG VS. FOG RESISTANT Fog resistant goggles fail because they're more work than they're worth, requiring you to constantly adjust vents, turn on fans, or repeatedly wipe the lens. Active Anti-Fog technology works without you having to do anything because the lens is continuously powered—never allowing fog to form in the first place.