Good mittens. In themselves, warm. Plus more heating Tested mittens. At minus 20 degrees. It seems warm, but they have some kind of decision wrong. Heating goes from the inside and outside. That is, energy saving is ineffective. Current consumption from powerbanka-2, 28 amperes. And does not change. That is, there is no thermoregulation. Well, so, sewn well. In themselves, warm.