I've used Insul-brite, and Insultex. For a hat, I'd go fleece, some insulator, and a ripstop windproof shell... I'm not sure a vapor barrier is a good idea on your head...
I can see it in a hood, maybe, as long as it wasn't cinched down tight.
Dave
"Loneliness is the poverty of self; solitude is the richness of self."~~~May Sarton
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