I have woollen earmuffs and they are really comfy. They do the job of protecting ears well enough and I don't really have to worry about hair statics as they only cover ears and not my hairs. But many times I do get advice against using those earmuffs and wear a woollen cap instead. If protecting ears is the only reason of wearing caps than I don't think i should leave my earmuffs but most people, though unknown of any scientific proof, claim that caps have more of a advantage than just that. Is it really so?
closed as primarily opinion-based by David, Amory, canadianer, The Last Word, Bryan Krause♦ Jan 24 '18 at 16:47
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This article is what you need: http://www.bbc.com/future/story/20130708-is-most-heat-lost-from-your-head . Citing an excerpt from it:
[H]aving your head immersed in cold water only adds 10% to your overall heat loss in a cold pool. And given that the head accounts for 7% to 9% of the body’s surface, that doesn’t seem excessive.
But before you throw your collection of woolly hats in the bin, there’s another finding to bear in mind: when the head is allowed to get cold and the body is effectively insulated, the body’s core temperature drops a lot more rapidly than most people would expect.
In the end, wearing a woollen cap prevents the body's core temperature to drop too low. So if the rest of your body is well covered, you can skip the cap and put just your comfy headphones on; if, on the other hand, your clothes don't protect you well, putting a woollen hat on may be the easiest way to not feel cold.