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 optics 5-base cylindrical shield lens curvature Slight wraparound fit Megol temples and nose pads provide non-slip grip so glasses stay put Two-position, adjustable Megol n High impact resistant TR90 nylon frame AutoLock hinges hold frames open for easy one-hand on and off Smith Shift Split MAG Sunglasses