Lenses feature Oakley's HDO Optics with Polaric Ellipsoid Technology; Lenses feature a permanent anti-fog coating on the back surface; UV protection of Plutonite lens material that filters out all of UVA / UVB & harmful blue light up to 400 nm wavelength; Meets or exceeds high mass and high velocity impact requirements per ANSI Z87.1-2003/2010; Meets or exceeds ballistic fragmentation impact standards per MIL PRF-31013, Clause 3.5.1.1.; Secure fit even under wet conditions via Hydrophilic Unobtainium nose pad; Clear lens features 89% visible light transmittance, suitable for use in low light to no light conditions; Persimmon lens features 69% visible light transmittance, suitable for use in low light to no light conditions; System features quick, tool-free lens change; Ultra lightweight design (1.05-ounce total weight)