I really like the cheap usb-c charged pocket hand-warmers that are available all over amazon/alibaba/whatever. I keep it in the front pocket of my sweater, it l

I really like the cheap usb-c charged pocket hand-warmers that are available all over amazon/alibaba/whatever. I keep it in the front pocket of my sweater, it lasts for 12+ hours, and it helps my ailing arthritic hands stay warm during the idle time where my hands don't need to be on a keyboard.