technical excellence and aesthetics combined. the vonzipper capsule has a fog-free, cylindrical double lens and is equipped with the vonzipper 4play lens interchange system. the triple density foam on the face ensures comfort and optimal moisture balance.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. the wildlife blackout lens is perfect for sunny days and the glacier.transmittance of visible light: 6 %