Already commented this, but this pillow sounds almost exactly like what you’re looking for! UTTU Sandwich Memory Foam Pillow, Adjustable Firm Pillow
I was in a car accident in November and have suffered from mild-to-severe neck and back pain since. This pillow has, quite literally, CHANGED MY LIFE. It’s firm memory foam that has multiple inserts/layers so that you can choose how many to use and thus choose what thickness you like. It keeps your neck in a straight line (rather than sinking your head down or forcing your head up) which has been a game changer for dealing with my neck pain, and thus helping with my chronic lumbar pain as well.
And, for reference, I’m in my mid-20s, so my body’s not old enough to justifiably have chronic, otherwise unexplainable joint pain. This pillow is the real deal.
VERY highly recommend!!
GET THIS PILLOW!!! UTTU Sandwich Memory Foam Pillow, Adjustable Firm Pillow
I was in a car accident in November and have suffered from mild-to-severe neck and back pain since. This pillow literally CHANGED MY LIFE.
https://www.amazon.com/-/de/dp/B07D3Q5CQT
Seems like they have an entry for Amazon.com but it's currently unavailable