technical goggle with wide field of vision . the vonzipper mach vfs signature goggle integrates the technical aspects of its predecessor while giving you enhanced features and a classic goggle design.their ventilation system draws moist air out of the goggles as long as air is flowing through them, giving you the clearest vision. in addition, their design provides a very wide peripheral view.wildlife blackout lenswildlife lenses work like polarised lenses, only they filter out an additional 99.9 % of harmful hev rays. as with polarised lenses, glare is reduced and contrast is increased.this lens offers perfect vision on sunny days.transmittance of visible light: 6 %