I've used this for about 5 years, so there's some dirt and discoloration. I think it can still be used as a cushion. Only those who understand, please! Round cushion Silky & Smooth It says the diameter is about 37cm, but it's about 40cm now, perhaps because I've sat on it for many years (just for reference, as it's a rough measurement). Gray It will be shipped folded compactly! ☆ I'm also selling various other items, so please take a look if you'd like (* ´ ▽ ` *)