The picture I linked is of a buckwheat pillow. Had no idea they were a thing before today.
What about silk or bamboo pillow cases?
I’ve only ever really used cotton pillow cases and cotton stuffed pillows. I recently upgraded to a foam pillow that I’m enjoying.
I’m enjoying a kapok as well as a down pillow. Only natural for me, nobody off-gasses on my face.
real silk pillowcases are just too slippery for me (and you have to wash em in a bag) so I stick with cotton.