Leanking Round Seat Cushion Low-Rebound Mesh Cushion I used this for about a month after purchasing it new. I don't see any noticeable stains. Here are the product details from the following site↓ 【Latest Memory Foam Cushion】: Size: 40cm (length) X 45cm (width) X 5cm (thickness), Main Material: Low-rebound memory foam, Cover: Breathable mesh material, Weight: 550g. Note: There is a small amount of anti-sticking powder on the surface of the cushion; if you are concerned, please remove the cover and wash off the powder. 【Low-Rebound Memory Urethane - Washable】: The inside is made of low-rebound memory urethane, which conforms to the shape of your buttocks, making it easy and comfortable to sit on for long periods. You can easily wash the cover by opening the cushion's zipper and removing it. This allows you to keep it hygienic. 【Highly Breathable - Comfortable to Sit On】: The highly breathable mesh material provides a refreshing feel. The hollow design maintains airflow, achieving excellent breathability, and prevents stuffiness even when sitting for long periods. 【Ergonomic Design - Pressure Distribution】: The cushion is designed based on human mechanics and can slowly deform to match the curves of your buttocks and thighs. It absorbs body pressure, reducing the burden on your buttocks and lower back, making it less tiring to sit for long periods. Sitting in a way that conforms to the shape naturally maintains a forward-leaning posture and gently stretches your back muscles. 【Multi-Purpose & Notes】: This seat cushion can be used in various situations, such as offices, cars, and homes. It is recommended for drivers, students, those who work at a desk for long hours, and the elderly. Note: The cushion is vacuum-packed, so it usually returns to its original shape in 1-2 hours. However, if the surrounding temperature is low, it may take longer to return to its original shape. Please wait a while. To speed up recovery, you can also apply warm air with a hair dryer. Alternatively, you can remove the sponge, soak it in hot water to soften it, inflate it immediately, and then air dry it indoors.