This is a pillow supervised by a chiropractor. I accidentally purchased the long type instead of the regular type, so I am selling it. It is unused, but I took it out of the bag once, so I've listed it as "like new." I personally use the regular type, and it's comfortable to sleep on and easy to care for, so I find it very useful. The long type seems to be better for those who toss and turn a lot or sleep on their side, so if you've been interested in a chiropractic pillow, how about this one? For reference, I purchased it for 9,790 yen.