The men's Anon Circuit Goggle was designed for the best possible fit with a helmet. It features Magnetic Facemask Integration (MFI®) that seals Anon's MFI facemask accessories (sold separately) to the goggle in one quick snap. SONAR lens technology by ZEISS enhances contrast for the best possible definition and terrain recognition. Toric Lens Technology 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 for fog-free clarity. The Circuit goggle is Over The Glass (OTG) compatible for wearing with eyeglasses. Includes a microfiber goggle bag for storage and cleaning the lens.