Thank you for viewing. This is a "Back Muscle Stretch!" cushion purchased at Don Quijote. It has only been opened and is unused. I threw away the box, so it is not included. The following is quoted from the HP: "Back Muscle Stretch!" Cushion - Passion Here! Supervised by a charismatic chiropractor who has been involved in the treatment of over 20,000 people and is well-versed in lower back issues! This cushion stretches your back muscles just by sitting on it! The key point is that it is designed to improve posture naturally by sitting on the ischial bones and tilting the pelvis. Maintaining good posture reduces the burden on the lower back and buttocks! It is a low-rebound type that excels in pressure distribution. Furthermore, it has four excellent functional points! ・Gently wraps with air layer knit fabric. ・Mesh material on the sides makes it less stuffy. ・Non-slip processing prevents slipping from the chair. ・Washable cover* for continued clean use. *Stuffing cannot be washed. Product Overview ■【Cover】 Surface: 100% polyester Mesh part: 100% polyester Lining: 100% polyester ■【Body】 Filling: Urethane foam ■【Size】 Approximately 38 x 43 x 8-13cm