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 use a buckwheat pillow with a mulberry silk pillow case. I live in Miami and I like a cold pillow, and that's the coldest combination I could come up with. they also have those blue gel cooling pillows, they're pretty uncomfortable, but I keep one under my buckwheat pillow, also in a silk pillowcase, so that I can flip my buckwheat pillow and the cool gel can draw the heat off so the other side is always cool for me. and silk pillowcases work a lot better than satin