I've slept on a few of these. They stay nice and cool, but the noise can be a bit distracting at times...
Discussion
Yes, nice and cool! The noise only bothers me when I'm worried it will disturb my sleeping spouse, otherwise I seldom notice it any more.
I will see if I can find one that's reasonably priced.
This is the one I have. The price has gone way up since I bought mine.
https://sweetzzzmattress.com/products/buckwheat-pillow?variant=42285752713369
Thank you!