The Baxter frame is utilized again 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. No need to interchange lens, this one does it all for you. 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 glass.