The Oakley OO9171 Racing Jacket Sport Sunglasses frame incorporates Oakley Switchlock™ Technology for fast and easy lens changing so you can optimize your vision for the environment. With two sets of lenses included (One for bright light and one for low light) and icons you can change whenever you want to, this frame is highly recommended for those who like to change with their mood. You needn’t worry about the changeable lenses slipping out of place as the retaining strap is as good as you would expect from a top of the range premium frame. This frame also boasts 8.75 base lens curvature, which gives a wide-open view with superior side protection and is created using O Matter® material, which is extremely lightweight. The Oakley OO9171 Racing Jacket is available in 2 colours and frame size 62x18 Oakley OO9171 37 Matte Black/Prism Road.