The Stride frame is utilized in this polarized and transitioning lens. This lens is acetate for maximum changing of lens shades. It will go from very light shades in low light conditions to maximum darkness in high light conditions. We invite you to do a little price comparing and you will see the great value in this glass. TR-90 frame, one year warranty, classical styling, many reasons to own this great glass. Just like the Baxter this frame has the injected rubber molding for the temples so rubber is always on your ears for comfort and non-slip. Great for small to medium faces.