Gloves......Tried many over the years, all offering warm fingers, but never found anything better than loose fitting ski gloves. Loose fitting because you can sit with them on (I'm talking sedentary fishing here, in very cold weather ) but still have your hands out of them in a trice, if a 'run develops or the float starts to go away.
The 'loose fitting' aspect also means you can bring your fingers out of the finger holes and move them around ( in the area meant for the upper hand ) to give them more movement, without actually withdrawing them from the glove.
It's only my opinion, but I think having fingers stuck down standard gloves and trying to induce some warmth by rubbing together doesn't work as well....
Ski gloves are made for extreme temperatures, and although not perfect they can do a good job. I nicked my pair from my son many moons ago after a school ski trip and they still work very well....NOT in all conditions (trotting etc ), though !
Alternatively, I've found an extra large 'fishing cloth' on the lap and lightly wrapped around the hands, whilst waiting for a bit of action, can give some immediate relief from the elements....
Hands, as with feet, need special care and attention, IMHO