509 Black Duke Trigger Finger Mittens Large509 Duke Trigger Finger Mittens Cold out there? Better pack the Duke Trigger Finger Mittens. Packed with 600 grams of insulation on the back of the hand and 200 grams on the palm these mittens provide smooth dexterity, adapted specifically for rider hand positioning. Articulated construction prevents cold spots when on the bars, while the unique trigger finger construction insures covering that brake when you need, while still holding on. When your