Here’s another one I can recommend!
Hubby and I both use this – great for those who need extra neck support – his is from years ago and it feels thicker than mine which is fairly new from a few months ago:

I also like that that these are hypoallergenic “Filled with millions of micropedic beads, they instantly conform to your body and provide optimal support all night long.”
They come with smooth, zipper-cases which can be washed.
In our home, we add an additional soft pillowcase