It's never bothered me but if you can't get your company to spring for an expensive upgrade this kind of thing works well. Looks like has enough battery for any 320/321 leg. As long as you keep your toes warm, the blood flow doesn't get restricted for cold adaption so everything south of your belt is good. I've used similar gadgets in colder environments than a bus cockpit.


https://www.amazon.com/4000mAh-Batte...75756363&psc=1