I have found Givi's S180T, and a few from MRA and other manufacturers.
I have Yamaha's rather lovely Tall Screen, designed for the Nmax. It looks good and works well and I can live with the airflow hitting me at the top edge of the helmet's visor on dry days. The little problem I have is when it rains; the airstrike at the top of the visor drives rain exactly at the spot where it then moves/pours down the visor and helmet. This gives me a 'windscreen washer effect' downwards which then causes all that rain to soak my lap and groin as well as that 'falling curtain-of-water look!!
There is a little wind noise. This noise is usually accompanied with a buffeting but with this screen it isn't at all annoying - the windscreen-washer effect is however.
I could live with this and there are ways around this - I could just slip on my waterproof bottoms, slow down
![Smile :)](./images/smilies/icon_e_smile.gif)
Any thoughts as to their efficaciousness?