Actually, the one I have, kind of fluff’s up by itself. But the pillow is a fairly lofty and dense. So it compresses and fluff’s back up. My horsehair pillow does the same thing.
I really have not had to beat the heck out of either the wool or the horsehair to keep either of them fluffy.
Actually it was my wool pillow, using it under my hip to shoulder on bad back days, that prompted me to get my 3" wool topper, which is awesome too.
They are just great!