The Brass Knuckle Spectrum Eye Protection, No. BKFLEX-4040N, features BK-Anti-Fog lens protection that permanently bonds to the lens and will not wear or wash off. For comfort, Spectrum offers bowed, super-flex rubber temples that ratchet for custom fit. They touch the wearer only behind the ears, eliminating all pressure points. Additionally, Spectrum includes a nosepiece that slides up and down as well as pivots on a hinge for added secure fit. The lens are available in five colors: clear, smoke, amber, indoor/outdoor clear mirror, and blue mirror.