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.