I use polyester fleece "glove-mitts." They're half-finger gloves that have a "mitten" piece which can be pulled over the fingers for extra warmth (like when you're hoofing it from one hole to the next) or pulled back and secured to a piece of velcro on the back of the glove so you can use your fingers (like when you're tying a knot). The nice thing about polyester fleece is that it still retains some of its insulating ability even when it gets wet. Even so, I usually carry a spare pair in my vest just in case I take a swim.