Four self-locating magnets assist in lightning-fast lens replacement while four snap pins keep the lens securely locked in place. Meanwhile, the medium fit accommodates a wide range of face shapes while boasting an impressively wide EXV field of view. The Axis also includes two of the best lenses in the business, premium VIVID lenses with Optics by ZEISS. Included is one sun/all-conditions lens and one Infrared storm/low-light lens, so you&';re always ready when the conditions change. Anti-fog coating Expansion View Technology (EXV) - creates an unparalleled field of view by engineering frameless zones to optimize a massive spherical lens and yield maxiumum peripheral vision Includes two VIVID Lenses with Optics by ZEISS - sun / all condition lens and low-light lens OTG friendly Triple-layer face foam with microfleece facing Adult Medium Frameless Design Injection-molded cylindrical VIVID lenses with Optics by ZEISSA(R): Over-the-glasses (OTG) friendly: Seamless Compatibility with all Giro helmets Seamless Compatibility with all Giro helmets EVAK Vent Technology uses a new foam made from an ultra-durable, non-absorbent material. EVAK vents minimize the chance of fogging by releasing moisture while simultaneously creating a barrier from the elements.