In reply to gimmergimmer:
> But more suggestions welcome.
If you don’t mind bulky look, my go to for cold wet mt biking are a Sealskins one https://www.sealskinz.com/products/waterproof-extreme-cold-weather-gauntlet
Gone up in price a lot (had mine many years) but they are great for flexibility despite their appearance to control brakes, etc, the inner stays put even with wet hands so easy on/off, take loads of abuse, fully waterproof, etc.
They have primaloft gold insulation and are good for warmth down to freezing though forget the extreme cold in model name suggestion. Mt biking for hours in minus temps and fingers do get cold. I though use a silk liner at times and as they are the gaunlet version I chose deliberately I can put hand warmers in at the wrist where they are held securely for the really cold/long rides.
Watch out for Sealskins sizing which is or was way off; used to need to size up 1 or 2 sizes for some of their glove models. I went up 2 sizes for this one when I bought.