I purchased this in June, but I'm selling it because I never used it. There is a small stain on the fourth photo. Please understand that this is a used item before purchasing. Cushion: High-resilience urethane Cover: Brushed material (nylon) [Improved Cover] The cover is removable and can be easily washed in your home washing machine. Size [Outer circumference]: 40cm (length) x 32cm (width) x 6.5cm (thickness) [Hollow]: 17cm (length) x 10cm (width) Weight: Approximately 400g [For postpartum mothers!] For those who find it painful to sit due to episiotomy, hemorrhoids, etc. that occur during childbirth... This is a "donut cushion" created for those individuals. It's a donut-shaped (oval) cushion designed to prevent the perineum and buttocks from touching the ground when sitting. We received advice from a [midwife & nurse] who is knowledgeable about postpartum problems, and it's made with the desire to make sitting as comfortable as possible. In addition, customers who suffer from sciatica, prostatitis, coccyx pain, etc. also use it. #DonutCushion #DonutShapedCushion #LowResilienceCushion #Rozally