3M™ SecureFit™ 500 Series SF509AF-BLK, Black, Silver Mirror Anti-Fog/Anti-Scratch Lens, 20 ea/Case. 3M™ SecureFit™ 500 Series features a contemporary lens design coupled with adjustable ratchet temples and 3M™ Pressure Diffusion Temple (PDT) technology to help provide a more personalized fit. This sporty eyewear also offers self-adjusting colored temples, a variety of lens tints and models with Scotchgard™ Protector Anti-Fog Coating.