I've been getting lots of inquiries about my winter helmet! It's not much different than wearing a toque underneath your normal helmet, but I like the tight seal around my head and ears. Plus, the back of the helmet has this clip that keeps my goggles in place when I am riding in severe cold.
I bought mine online, and was reminded of the site when a reader sent me a link to Empire. That's where Don and I got ours from! Though, I do believe they carry Bern at MEC as well (I don't think they had my size with the liner back when I was looking).
Thought I would let you know, since I see they are on sale too. Mine has a brim and an air vent on top (some of them don't have a vent).
Happy winter riding!