Goggles only work when they are properly on your face. Our "Top Shelf" clear lens chemical splash googles have added Anti-fog coatings so less chance for the google to be taken off when working. These lenses also provide 99% protection against harmful UV rays and exceed ANSI Z87.1 - 2003 High Impact requirements. The G304T safety goggle feature a generously sized heavy duty body and lens for better visability yet designed to reduce glare. Special one-way vent allows air to enter while keeping liquids out. Fits comfortably over prescription spectacles.