Lobster claw type pair fingers to mutually warm each other. that is almost as good as mittens.

I purchased some Spenco full finger gloves, and theyre OK so far, still above 0 here
neoprene sailboard gloves are decent but as they are a sponge though closed cell,
will absorb heavy rain.

Offshore commercial fishers/crab pot haulers wear several layers of rubber gloves..