Naturehike High R-value Air Mat R3.5 Thick 7cm Ultralightweight Size R3.5-M (183x64x7cm) Rectangle Black I mistakenly purchased the wrong R-value, so this is a new, unused item. The circles in the image are not stains, but part of the design. I apologize, but as this is a personally owned item after purchase, please refrain from purchasing if you are overly concerned about minor details. Please ask any questions in the comments section.