Airfoil Day2Nite 9311 - Grey Photochromatic/Black Frame - These lenses are dark outdoors in the daylight and lighten automatically to almost clear when worn indoors or at night The Airfoil 9300 series is a tour de force in wear-over motorcycle goggles, designed with form, function and fashion in mind. This market-dominating style comfortably accommodates most eyeglasses without pressure or pinching and without the unfortunate "bug-eyed" look and feel of larger accommodating options. Wide-paneled one piece lens provides a greater field of vision, and substantial ventilation hits back against irritating fog for optimum clarity. The bottom line: if you're looking for bulky, frustrating wear-over eyewear - look elsewhere! - 100% UV protection - 100% Shatterproof polycarbonate lens - These goggles can be worn over most prescription glasses - Case and cleaning cloth also included - Note: All photochromic lenses will not darken behind a faceshield or windshield and will not fully darken in very warm weather conditions.