When I was sailing the inside passage, in the winter, we had
Dachstein mittens
Beyond a doubt they are the best mittens made. They wore like canvas, and they were so warm your hands would sweat when working even when the mittens were wet and it was sleeting.
And remember, when you're wearing wool, if it's cold and wet, you're warm and dry. Or as one fishing boat captain I met said, "If you're cold and wet, then you're warm and dry."