Windscreens. Most any one you choose will still require that you clutter up your lower fork shrouds with little wings. The air flow from below must be acquitted. Even if the glove fits.
Cinnamon Girl came with a summer screen. Riding her home through Oklahoma in the Summer of 2007 that screen just about became a 'Frisbee'. Vera Lynn's Roadster screen is leaning up against a closet wall as is CG's. Screens? Try a full face helmet and leave the screens on the porch. Of course this advise is from a Floridian, where freezing temps, sleet, freezing rain, and snow are analogous to hens teeth.
Matt (Mlessard) gives ole man winter the finger without using a screen. gotta admire them yutes.
