high-performance goggles from anon with perceive lenses . the anon m4s cylindrical goggle offers a precise fit with a wide field of vision and flat, cylindrical lenses. optimal for the combination of helmet and goggles. innovative magna-tech® technology allows for quick and easy lens changes through powerful magnets and offers unprecedented versatility.this version of the m4 comes with two cylindrical lenses with perceive optics for high-contrast clear vision in any terrain. high-quality anti-fog treatment ensures crystal-clear vision in all weather conditions. magnetic face mask integration (mfi®) offers seamless face mask attachment, while full-length vents provide consistent air circulation for clear, fog-free vision. perceive sunny onyx lensthe perceive sunny onyx lenses are suitable for sunny days. perceive lenses give you high contrast to better see the terrain. transmittance of visible light: 6 %perceive variable violet lensthe perceive variable violet lenses are designed for changeable weather conditions. perceive lenses give you high contrast to better see the terrain. transmittance of visible light: 34 %