Comment by mc_maurer

https://www.kinco.com/5210-l

I wear these walking the dog down to -20F or so. They're warm enough with the tops flipped up, and you can quickly flip them down for a little dexterity to tie a poop bag. Not gonna say your fingers won't get cold while you're doing it, but it's the best approach I've found short of multiple pairs of gloves, which is just a pain for a quick dog walk.