This accessory decal is designed to work with UNIT Garage windshield, and offers a UV Resistant film. 

The internal part of the decal, on the rider's side, is black, and it's great for hiding the wiring or rear instrumentation in the transparent fairings.

This sticker is designed to work with —although it's a bit redundant with the Dark Smoke options. 

Is it crazy expensive for a decal, even a UV resistant, well-thought-out one? It sure is. And that's why it's offered as a purely optional accessory.