Shift Split Mag | BlackVision ChromaPop lenses enhance contrast and natural color to make the details pop Light sensitive, photochromic lenses adapt to changing light conditions Smith MAG lets you change lenses quickly Smudge and moisture resistant coatings for easy cleaning and clear opticsFit Integration Medium to large fit large coverage 5 base cylindrical shield lens curvature Slight wraparound fit Megol temples and nose pads provide non slip grip so glasses stay put