I ride all winter on an old style KLR as my salty beater. Not much wind protection on it so i use long underwear and alot of layers. -13C was my coldest ride last year but have not hit that yet this winter. Heated vest was my only electrics and that malfunctioned last spring so i have to replace it someday. I found if my core was warm i could deal with the extremities. Once my body got cold the bloodflow to my fingers/toes was compromised.
R1150 GSA, KLR650, K75s, RD350, PS250 (Big Ruckus), R65, 990 Spyder
If I still had every dollar I spent on motorbikes I would be a richer man but a poorer person.