This is a mattress for the Soinel III cot. I purchased it new and used it from May 2025 to December 2025. I used it with a waterproof sheet + sheet + thick gauze towel blanket on top, so I think the condition is quite good. However, I found a stain as shown in the photo, so please understand this before purchasing. As of January 30, 2026, it appears to be sold out on the Yamato-ya website. *The frame is also listed separately. Please take a look if you're interested. (Please note that it may be sold out.)