Used only 4 times with a pillowcase. The main cover has been home-cleaned. Pillowcase not included. There is a wrinkle-like mark on the gusset from the time of purchase. Please check the last photo. Unfortunately, the height didn't suit me, so I'm selling it. [Retail Price: 6,990 yen] Outer fabric: 100% polyester Filling: 100% polyethylene From MUJI's website: The structure and design are made to smoothly accommodate any sleeping position, whether you sleep on your back or side, as your posture changes with movement. The center part is lower and softer than the sides, designed to allow your neck to be at a natural angle when sleeping on your back. When sleeping on your side, it is desirable for your neck and spine to be straight, and for your shoulders not to be compressed, so the sides have been made higher and firmer.