Latex pillow. They do NOT lose shape/consistency at all. Trust me, I bought a latex pillow and I pretty much always use the latex pillow now. I use the larger memory foam pillow when I want a harder/thicker pillow, but otherwise I prefer the latex pillow since I don’t have to worry about constantly fluffing it up or anything. I still flip it around sometimes to get to the cold side of course, but not as much for other pillows. Some people want “ergonomically-shaped” pillows, which have a bump for neck/spine support, and those kinds of latex pillows exist too.

A lot of people swear by buckwheat pillows too. What I can say about them is they’re firm and heavy, they stay cold, they have a smell, and they whisper statistics into your ear when you’re trying to sleep. They’re probably better if you want more neck support.