Recirculate cockpit air to keep feet warm?
I have used that idea - neoprene cycling boots over ordinary boots + thick socks. The neoprene helps a little but absolutely nothing like as good as Skyboots 3g or 4g over flying boots. Chemical warmers are ok but a bit pot luck. Electric insoles or socks are OK but the batteries are a nuisance - I have various types in my sock drawer.
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