Home made sun visor for helmet
I use a peaked motorcross style helmet a lot, so when I go back to a normal full face with just the face shield, I miss the peak at certain times of the day, because it keeps the brightness and the sun out of my eyes and off my face.
Bit of thinking and ta da...impromtu sun visor.
Use two or three strips of black electrical tape, stick it along the top of the face shield. One strip just overlaying the one above.
I use three strips, from one side of the face shield to the other.
When I pull the visor down the black tape shades my face and keeps overhead glare out of my eyes.
The strips do not affect your line of sight unless you are bent low over a sports bike or tend to ride along watching the overhead sky for UFO's or circling vultures.
If you need to change the strips or want to remove and then clean the sticky residue off the visor, simply rub with eucalyptus oil. Cleans sticky residue great.