There is that, but as much as anything else I would like to keep the EP's slightly above ambient when they are not in use.
I find I need to be really careful in the winter as if I have a beanie on (So a nice warm face) I find the EP can tend to immediately fog when I first go to use it, then clear a few minute later as the EP heater warms it. I need to keep my face way from the EP unless it feels like my nose is going to drop off with the cold! I would like to be able to go back to a balaclava in the really cold weather.
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