Mine was made by CrownCap, as Phat says, in Winterpeg Canada. It is rabbit fur and is very warm. I think I ordered it from the Sacred Feather, a hat store in Madison, WI. I've tried sleeping in it. I find anything other than a simple knit hat too confining and usually don't pull my sleeping bag hood super tight either.
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If I wouldn't eat it at home, why would I want to eat it on the trail?