Snow is fun - suck it up!
I’ve seen hand warming packs for hunters, et al. but they are disposable, which really isn’t my style. I try to stay away from disables as much as humanly possible. I like reusables. And then there’s the question of what’s in that stuff that makes the hot packs hot on demand. That’s not something I want Mr. Fluffypants find and use as a chew toy either.
But having a nice warm pack in my gloves would be a pleasant way to keep the cold from eating through my gloves and making my fingers go numb when walking the dog on a winter’s day.