"SPX Illusion throws a curve to conventional style. Imagine wearing a contemporary-modernized full rim style that feels just as good as wearing nearly nothing at all! SPX Illusion offers extreme comfort and lightness due to our patented SPX material, along with color and finish stability," notes Midwest Lens. "Silhouette’s patented High-Tech Titanium and proprietary SPX material provide unparalleled flexibility and durability: SPX is twice as strong as acetate, most commonly used in the market. The SPX material revolution set the standard of excellence and high quality in the eyewear industry, and Silhouette as a leader in innovation, style, and design." Read more.