Iβm exclusively a very hot side-sleeper, so dialing in my pillow setup has taken decades.
I use three different types of pillows: a real down pillow for my head (this one was expensive, but seriously worth it), a faux down pillow for hugging (keeps its fluffy shape all night), and cotton-filled pillow for between my knees.
The fillings are what matter most to me, and the real down pillow for my head is the most recent and best addition imo. It has made a massive difference to my comfort over the memory foam one I had been using previously. I splurged for a Parachute down pillow because the high quality is immediately obvious, and itβs hands down the best pillow Iβve ever bought.