The coldest I've ever ridden in was -7C (19F) this winter and I felt that it was about my limit. That snowmobile suit might be better than my cordura suit with 2 sweaters and a pair of underpants. Fortunately my heated gloves were still enough at that temp, but my hands would freeze without that. I don't even know if there's any glove that insulates like my body clothing or better (so it doesn't need extra heating) yet it's thin enough to operate the clutch, brake and turn signal switch. Aerogel wool, maybe?
(Aerogel wool socks would be nice too!)