This is a baby roll-over prevention belt. I bought it in July 2025. I only used it once, and then put it away without using it again, so I'm listing it because it's a waste. It's relatively clean, but it's a used item, so please understand this before purchasing. It's a size L, white. I bought it new on Rakuten for 3980 yen. Thank you for considering it (o˘◡˘o) The dimensions are: Width: 75cm Length: 56cm I was using it on a standard single futon.