I wear Descente Weather Warriors with good, thin, wool liners.
They fail miserably at around +20 F.
In other threads on this subject, several people have recommended pogies.
I don't know.
I ride with flat bars and barends, with a mirror on the end of my bars.
I like moving my hands around, too, and I don't know if pogies would allow this.
I have thought about going outside of normal bicycle supply houses, maybe motorcycle gloves.