X-KD'S - 1011 Day2Nite Lenses That ChangeX KD Day2Nite 1011 Grey Photochromatic Black Frame Note to our new KD customers: KD's are a small sunglass that's the cool look, that's the fit. These lenses are dark outdoors in the daylight and lighten automatically to almost clear when worn indoors or at night Lightweight 100% UV protection Anti Fog 100% Shatterproof polycarbonate lens Photochromic Lens Information All photochromic lenses will not darken behind a face shield or windshield