I wear Outdoor Research Alti Mittens and love them for super warm gloves. These mittens keep my hands warm in very cold temperatures. I’ve worn them in below 0 temps without any issues. By far the warmest gloves or mittens I've ever owned.
For a warmish glove to use while active, check out the OR Project glove. It's made primarily for ice climbing so it maximizes dexterity over warmth, but still has a good amount of insulation.
Outdoor Research also has the best warranty in the industry. They'll replace abused gear for free, no questions asked, so I definitely recommend OR gear for just about everything.