Z is smooth. Its essential rectangular lenses are encased within thin yet sturdy metal rims which wrap around into thick metal plates to accommodate the tall acetate temples. counterbalancing this essential, almost minimalist design, the Z features a unique organic touch with a thermoform acetate temple with details resembling a liquified ring of saturn. This version comes in a ruthenium metal finish with black acetate temples and burgundy lenses. RetroSuperFuture RSF Z Bordeaux