Subtle doesn't have to mean boring. A squared-off silhouette with modular color play sharpens the original HSTN attitude, while premium metal details keep the look elevated. O-Matter™ Frame: Oakley's injection molded thermoplastic frame material provides improved strength and flexibility over traditional acetate, and is built to withstand shifting or deforming over time. Unobtainium® Nosepads: Unobtainium is the first innovative material patented by Oakley to ensure maximum comfort by increasing grip with perspiration and keeping the frame in place without slipping.