The original windscreen is high enough to protect the upper body from wind and weather, and can be adjusted to an even higher position. 

But for my height (187 cm) there was always a lot of wind noise (wind turbulence) around my helmet – no matter how I adjusted the screen. 

The small Puig wind deflector eliminate the turbulence (or move it to a position above my head), and it is now amazingly quiet when I ride my bike. 

Brilliant piece of kit !