This is the helmet I use now, it is very light (1300g), I used to have the S1 but that was heavier, they are quiet but not so quiet that I can use it without earplugs.
Since I sometimes have problem with my neck I wanted a light helmet and the R1 seems to help.

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BMW R1200GSA -08, Schuberth R1 with Bluesonic, Garmin Zumo 660 not working with Bluesonic Sad