Not sure
I'm not sure the curve of this is correct. It seems it needs to be taller or more arched. The ad shows to use it with the long point going down your spine but I find it works a bit better if you spin it 180 degrees with the long point under your head.  It is very hard and uncomfortable. It does seem to help me at night though if I put it underneath my pillow so that I can try to sleep on my back and use it to keep my neck aligned. I hope you found this review helpful. Happy shopping!
Rating: 3 stars