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.
you can also just add more buckwheat if it gets too flat too. although fwiw I bought one a couple years ago and took out a bit to make it flatter initially, and haven’t needed to add it back yet