This is Nishikawa's Air 3D Pillow. I purchased it on October 30, 2025, from the official online shop for 18,700 yen. It arrived on November 1st, and I tried it for about 4 days, adjusting the height with a pillowcase, but the height didn't suit me, so I'm putting it up for sale. The cover has been cleaned. (It has not been used with direct contact.) Everything in the photos is included. I will ship it compactly enough to prevent it from being crushed.