I'm going into my real second year of phat bike riding during the winter. I was pretty successful in my attempt last year but I did things wrong. This year I think I'm more prepared.
The helmet is a snowboard helmet that includes ear covers.
I've also updated my boots with covers, updated my gloves and added a side saddle bag allowing me to layer off my clothing when it gets to hot.
This morning it was -2C and I was boiling hot by the time I got to work. So far so good!