I watched a YouTube video on relieving back pain where the presenter discussed a pillow with a zipper that allows you to adjust its thickness by removing shredded memory foam. I couldn’t find the exact pillow he mentioned, but I found a similar one. It’s fantastic and comes with a lifetime warranty. It’s such a simple yet effective idea.

Here is the product on Amazon: https://a.co/d/02HAtdng

Here is the video on YouTube: