This is the "Kiwami Yawa" (Extremely Soft) model of the Hitsuji no Iranai Makura (Pillow You Don't Need a Sheep) pillow, the highest-end model. Retail price is 22,000 yen. I purchased it from the official website and used it for about two weeks, but the height didn't suit me. The entire pillow is made of a silicone rubber-like material, so the feeling of putting your head on it is like a water pillow, and it's very comfortable. If the height had been right, I wouldn't have parted with it. (Sleeping on my side was comfortable.) The pillow can be washed, but I'm selling it as is. The pillowcase has been washed. Also, please be aware that there are oil stains on the inside of the box. I will ship it in the original box. (I will not pack it in another box on top of that.) Instant purchase is OK. Please read the profile before purchasing. [BIG size model, the largest in the series] Wide big size for those who like large and high pillows! The softest pillow in the Hitsuji no Iranai Makura series. It lasts for 10 years. [Comfortable sleep] You'll be enveloped the moment you put your head on it, like floating on water. [Smooth turning over] Made of a material (TPE) with moderate resilience, allowing for smooth turning over. [Selectable height] You can choose between 9cm and 11cm by changing the front and back of the pillow.