That's quite a hat, Nessmuk. 1st thing I thought, was "prickly heat". At -40 or colder, it would work perfectly. I don't have any hair left on the top of me
head and scant few hairs on the sides, now but the lining of a hat is very important to me. I'm mildly sensitive to wool.skin contact & the only toque I have
that I can wear, if it's cold enough, my older daughter knitted for me, from Alpaca wool. It's very light weight, but extremely warm.
Taylor and I were issued rat hats when in the "Force".