Have you ever tried attaching these to the inside of your wrists (where the blood vessels are near the surface) while hunting?
They help keep your hands and body warm.
I saw this mentioned recently on here. I made a mental note to try it out on the next cold hunt. I have used them for years, when deer hunting, for me and my daughters (on our toes).
I use mitten-gloves, where the built in glove part is a very thin liner. There is a zipper pocket on the back side, opposite your fingers, where I put a disposable hand warmer. That does help, but fingers can still get cold when it is wicked out.
When it is colder, I keep my left hand fingers in the mitten and only my trigger finger out in my right hand. It affects gun dexterity a little bit, but not so much that I can't shoot at all. With my right fingers out completely, I am at 97% and with the left hand fingers out, no difference than bare handed.
I got mine at Gander Mountain a long time ago. Now that they went out of business, I looked to see if there is anything similar out there. I found some by DSG Outerwear, but one of the reviews said they put the zipper pocket on the wrong part of the mitten (hand part instead of fingers), so that's a mark against them. This is what their version looks like:
There are other brands, but their fingers have a thicker material than the liner that mine have and that the above appear to have. Some others have the thicker fingers cut off at the tips. The reason I prefer the liner is because it maximizes warmth for the fingers when they are inside the mitten. The thicker stuff around the fingers doesn't allow the shared heat of the hand to get to the fingers when tucked into the mitten.
I can't cope with the thickness of regular gloves when it comes to my trigger finger. I suppose I could cut the trigger finger off of some of the gloves recommended in here and wear a liner. But mittens almost always win out over gloves when it comes to keeping fingers warm.
The stick on warmers, used on the wrist, might be just the ticket. I'll report back on whether it allows me to keep my fingers out more on 0 to 15 F days.