This is a Naturehike R5.8 mummy-type air mattress. The color is silver, and the size is M (183x58cm). I purchased it in December 2025 and only set it up indoors once, never used it outdoors. It comes with the mattress and an inflation bag. I intended to use it in cold regions due to its high R-value, but I no longer have the opportunity, so I am selling it. Thank you.