Thank you for viewing. This is a used WAQ 8cm inflatable mat. I purchased it 3 years ago and used it about 3 times before storing it. Before listing, I inflated it with an air pump and observed it for a week, and there was almost no air leakage, so it's in good condition. It has a mechanism where air automatically enters when the valve is opened, but it's quite slow. Also, there is some staining on the storage bag. Please understand that this is a used item.