I bought this on Amazon for about 3000 yen. I'm selling it because I don't use it! 【Size】Approximately 41cm wide x 7.5cm thick, body weight: approximately 480g. This is a floor cushion made of durable, high-resilience urethane, providing a comfortable sitting experience with appropriate firmness. 【Good Ventilation & Pressure Distribution】The upper layer of the urethane has a patented "spring structure" with uneven surfaces that supports the body in detail with points, providing excellent ventilation. It's recommended even in summer as it doesn't get stuffy even after sitting for a long time. It distributes body pressure well, achieving a soft sitting comfort and stability, and significantly reduces the burden on your body. 【Non-slip & Washable Cover】The back of the cushion has silica gel particles for excellent non-slip stability, so it can be used with peace of mind by children, the elderly, and pregnant women. Also, it has a zipper, so you can remove and wash the cover. It maintains hygiene and provides comfort in the summer when you tend to sweat a lot.