These Rimless 5479 Fusion eyeglasses by Silhouette are all about freedom, innovation, and vision without boundaries. These rimless frames are made from a combination of SPX and titanium. SPX material has extreme flexibility and tensile force resistance, ensuring the frames’ stability and durability. Titanium is hypoallergenic, corrosion-resistant, and strong. Cam action joints create a secure fit that keeps the glasses in place, preventing any unnecessary movement during even strenuous activity. So comfortable, you might forget you're wearing them. Express your high-quality standards and dedication to style with the Rimless Fusion glasses by Silhouette.