Hello! Thank you very much for taking a look at this item from among many others. This is a pillow developed by a chiropractor from a popular chiropractic salon, and I purchased it at the store for around 8,000 yen! I used it for a little while, but it was a bit expensive for me, so I hope someone else can use it. I used it with a pillowcase, but since it's still a used item, I will wash the cover before shipping it. I think it's especially good for those who sleep on their backs. Please use it with the higher side under your neck. 【Height】 Neck: Approximately 7.5cm, Head: Approximately 5.5cm (You can lower it by 1cm by removing the height adjustment sheet) Product number: AZ443 ● (Approx.) / 29 x 52 x 12cm, 700g ● ＜Fabric＞ 100% Polyester, ＜Filling＞ 100% Polyethylene