Mittens! I use deerskin "chopper mitts" with synthetic liner mitts (and sometimes liner gloves though mittens are considerably warmer). They have a wonderful, almost sticky grip on the bars so though you lose some summer hand grips, you gain some more. WHen the day warms, dtuff the liner mitts in your pocket and use just the choppers. Liners stay far cleaner (and are easy to wash and quick to dry).

My next move will be to add a strap to close off the cuff which will make them much warmer and more important here in Oregon , allow my jacket sleeve to slide over them and keep the inner mitts dry in the rain. (The drawback to long arms. Sleeves always ride up. Also require custom stems. My average stem length is 148mm over 6 bikes.)

Ben