Pacific Coast 9311 Airfoil Day 2 Nite These lenses are dark outdoors in the daylight and lighten automatically to almost clear when worn indoors or at night 100% UV protection Shatterproof polycarbonate lenses 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