I'm a 6 foot tall American with a Shoei RF-1200 helmet (Z7 in Asia). The stock OEM windscreen created turbulence around my helmet. And it blocked air from going through my mesh Revit jacket. And it looks bad. This MRA Sort windscreen resolved all of that. I still have wind noise, but without the turbulence. If I sit back with arms fully extended and my head tipped forward, it relieves most of the wind noise. Has much more air flowing through my mesh jacket. Easy to install and looks good.