The S edition offers a smaller size frame with enhanced lens coverage, and every millimeter of the peripheral view is optimized with High Definition Optics(TM) in a durable yet lightweight design that takes performance to the next level and brings style along for the ride. Design: Frame suitable for smaller faces. Same lens proportions as the original Flak 2.0, available in a smaller size Durability and all-day comfort of lightweight O Matter(TM) frame material Unobtainium nosepads and earsocks become tackier when wet to help provide retention Oakley lenses are designed and tested under extreme high mass and high velocity circumstances to ensure uncompromising protection across a wide range of demanding conditions Technology: Available with Prizm(TM) lenses to enhance color, contrast and detail for an optimized experience Additional Details: Lens Height: 36.9 mm Frame Width: 120 mm Arm Length: 123 mm Lens Width: 59 mm Bridge Width: 16 mm