Thank you for viewing. I purchased this from the official website last year for the regular price of 7678 yen. I used it occasionally, not every day, for a few months, and then stored it at home, hardly using it. There are a few small stains on the gray parts of the back and sides, but they are not very noticeable. I don't think it will cause any problems in use. Please check the photos 6-8 carefully. Please understand that this is a used item, and those who are sensitive to such things should refrain from purchasing. The following is quoted from the website: Backbone Stretching Lower Back Pain Relief Cushion Navy/Mustard Addresses the pelvis, sacrum, and spine to maintain a posture that is less tiring. Three-dimensional structure to support the lower back! Shock absorption x High resilience Supports the sacrum and straightens the spine. Reduces the burden on the lower back and promotes beautiful posture. * *Only when using this product ■Side The raised shape fits the buttocks and thighs. ■Three-dimensional seat The sacral elevation inclination works to raise the sacrum, which is in the center of the pelvis. ■Back The shape that covers the lower back pushes out the lower back, giving a feeling of straightening the spine. ■Back & Protrusions The large back and protrusions support the sacrum and straighten the spine. Uses high-resilience urethane. High-resilience urethane absorbs shock and supports "comfortable sitting". Uses mesh material. Good breathability and less stuffy. At home In the office As a floor chair ★Supervised by Dr. Kenji Kojima, Director of Kojima Chiropractic Clinic He grew up as a baseball player throughout elementary, junior high, and high school. After working in orthopedic surgery and chiropractic clinics, he opened "Kojima Chiropractic Clinic" in Osaka in 2010. He is supported by a wide range of ages for pain care such as lower back pain and sports injuries, and is known for being visited by many professional athletes, artists, and dancers. Manufacturer's suggested retail price ¥7678 (tax included) JAN code Navy: 4969133939358 Mustard: 4969133939365 Size Product size (package size) H43cm x W41cm x D24cm Body size 43 x 42 x 22.5cm Material/Ingredients ●Cover: <Seat/Bottom> 100% polyester <Side> 50% cotton, 50% polyester ●Cushioning material: Urethane foam Country of origin: China