This is a repeat of a post on another thread, but it applies here also.

As a former runner and now a winter cyclist, who ran everyday through 31 Michigan winters , I have tried many types and designs of gloves over the years. I found that the best hand and finger protection were from mittens. I have a pair of ski mittens that are over 20 years old; a simple design with a generous cuff, wind proof and are only moderately insulated. Fingered gloves cannot match the warmth of mittens, but windproof is the operative word here.

Be sure to select a pair that are wind proof. Try putting the mitt up to your mouth and make sure that you can’t blow through the outer material. They must be drop dead windproof. You really don’t need a lot of insulation because your fingers share their warmth. I have used my mitts in -15* temps and down to -40* wind chill factor when I added a thin pair of polypropylene fingered liners.

I switched from running to cycling this past summer. Although the weather is still too warm for mitts, I have tested them a couple of times. I wondered if operating the controls of my bike would difficult with the mittens. To my surprise, they were not a hindrance to my braking or shifting. This is probably because my mitts are not overly stuffed with insulation. Too much stuffing will be like trying to shift and brake with boxing gloves on. Again, windproof is the key.
Alfie