I also use the chemical packs inside gloves, on the back side of the hand where it's out of the way and warms 'the works', especially over the back of the thumb area.
I'm usually using wool, fingerless gloves with mitten pull-over covers and traditional leather 'choppers' on a cord if it is extra wet or cold while hunting, etc or light deerskin gloves. I usually carry both if far away from the car, as my heavy wool coat has a generous pocket built into the lower back, accessible from either side by-way-of snaps.
I have arthritis and the heating pads will work well all day, for a very long day. If they get too warm, I just drop them in side pockets until needed again in the gloves. I also have the pocket little heaters, some use charcoal for fuel, others lighter fluid. They also work but are not as useful as the chem.pads, IMO.
IIRC, some good quality hunting gloves are now made with pockets for these little pads.
Eli