Cool, essential and functional, the three key features of RSF design mark a new icon of contemporary eyewear that acknowledges past styles while gazing towards the future. Certo is a timeless frame, characterized by fitted, rounded lenses and protruding temple tips. A nod towards the most essential, everyday frames, this silhouette features glass lenses nestled in a light yet sturdy acetate frame. This version comes in black acetate with sophisticated bottle green lenses.