Sierra's timeless and flattering rounded P3 shape is a tribute to Revo's best-selling styles from the 1995 Classic and H2O Collections. Sierra is a smaller fit and features a classic keyhole bridge with spring hinges to hold it comfortably in place. The Smoky Green lens of this frame is a new addition to our camera lens-quality crystal glass lens portfolio; it's a general-purpose lens with a green/gray base and silver flash mirror.