Airfoil Day2Nite Black Frame Goggles with Grey Photochromatic Lens - One Size These lenses are dark outdoors in the daylight and lighten automatically to almost clear when worn indoors or at night Black frame with Grey Photochromatic lens 100% UV protection 100% Shatterproof polycarbonate lens Note: All photochromic lenses will not darken behind a faceshield or windshield and will lighten in very warm weather conditions.