Some call the Smith Chemist Sun Sunglasses retro. Others call them futuristic. Youll call them your favorite shades. Optically precise Base 6 lenses ensure crystal-clear vision in a wide range of lighting conditions, and the steel-reinforced nylon frames provide plenty of durability. Smith pulled out all the stops to make these sunglasses as unique as possible without bumping into an annoying look that no one wants.