This is a Therm-a-Rest ultralight air mattress. I believe it has probably never been used. I have confirmed that it holds air before listing it. Thank you. *Please read before purchasing* This item is a used product. Please understand this before purchasing. Also, as a measure against fraud on Mercari, returns are not accepted. If you have any questions, please feel free to ask before purchasing, such as requesting additional photos or checking the details of the product.