There is a very good reason that fake fur has not replaced the real thing in Arctic conditions and it has to do with the shape of the hair.
Synthetic fur is one thickness from it’s root to its tip, real fur tends to taper to a point.
This means that when ice builds up on the hair from condensed breath and the like, it sticks to synthetic fur but slips of the real stuff.
Nature has been designing it for millions of years, that’s even longer ago than some imaginary guy said “Let there be life.”
(Might as well offend everyone at the same time.)
On the whole I prefer to recycle fur when I can but I do use fur in my living history work and also on my Arctic kit where needed.
Now of course we know that sythetic fibres are causing untold damage in our rivers, lakes and seas so there is another thing to consider.
Knife makers were on every corner and street, some fairly standard some extraordinary.
I wasn’t in that market but I could have picked up some really nice work if I had wanted.