Photochromic Lens: Photochromic sunglasses is an?optical lenses?that darken on exposure to specific types of light of sufficient intensity, most commonly?ultraviolet (UV)?radiation.
Polarized Photochromic Sunglasses: The lenses color will be changed to adpat different intensity light automatically when moving indoors or outdoors.Polarized sunglasses eliminates glare and reflective, scattered light, providing vivid colors and natural vision
Ultra lightweight: Al-Mg metal temple and TR90 frame. Only 21g so you can hardly feel them on your face,