I used this cushion for about half a month after I fractured my knee the year before last because my buttocks were sore. The cover has been washed and is in a clean condition with no noticeable stains. Because I have a slender build, sitting for long periods without this cushion was painful and difficult, but thanks to this cushion, the pain was greatly reduced, and I was able to sit comfortably. Non-smoker, no pets. After I no longer needed a wheelchair, I washed the cover and stored it carefully at home.