I just have Neoprene gloves that I cut slits at the start of the finger (on the palm side) of the thumb, index and middle finger. When I need to tie knots I slip my fingers through the slits and tie the knot.
They are cheap and warm but you do get a bit wet and pruney since the slits will let a bit of water in and it doesn't dry out. But the key is they are warm and relatively cheap.