The lenses are 2mm thick UV400 shatterproof polycarbonate, providing superior eye protection. The UV400 filters give you maximum protection from the sun’s harmful ultraviolet rays. The Anti-Fog coating insures good visibility while foam-covered vents allow limited air flow and keep dust out. Yellow tinted lens increases both contrast and depth perception. The lightweight frame is made of thermal plastic rubber for flexibility and an exceptionally good fit. Windshield Goggles are large enough to fit over most prescription glasses. This way, you can avoid the expense of having to buy prescription goggle lenses. While others use cheaper foam, Global Vision uses only soft, high-quality foam that cushions the inside of the goggles so they fit comfortably. A Free Micro-Fibre storage pouch is included and doubles up as a safe lens cleaner.