Used item. I purchased it and stored it without using it. As you can see in the photos, there is some dirt on the back. Please refrain from purchasing if you are concerned about this. It's about 5cm thick, with a memory foam-like feel. I believe it's a prize item, but it's still a used item, so I don't recommend it to those who want a brand new, unused item. Thank you for your understanding. m(_ _)m Length: 31cm Width: 41cm There may be some slight errors due to the use of a measuring tape. Thank you for looking (*^*)