Hestra Comfort Tracker 3-Finger Mitt

Warmer than a glove but allowing more dexterity than a mitt, this style of handwear is popular with winter cyclists. The Comfort Tracker 3-finger mitt features a soft fleece lining and G-Loft synthetic insulation for extra warmth on cold winter days. The backhand is windproof and breathable, and the palm is made of durable stretch polyester. A neoprene cuff keeps the drafts out and fits nicely under your jacket sleeve. 

Hestra size guide (based on circumference of the hand):

Size 6 = 127mm
Size 7 = 152 mm
Size 8 = 178 mm
Size 9 = 203 mm
Size 10 = 254 mm
Size 11 = 279 mm
Size 12 = 309 mm