Used only once, inside a tent, and there is no dirt or noticeable stains. Currently, Amazon only sells yellow and orange versions, but this product is a color that is somewhere between charcoal gray and brown. It's almost new and recommended for those who don't like flashy colors. Size: 183cm length x 55cm width x 1.8cm thickness Weight: 410g Product Description -------------------------- Size: Approximately 55cm * 183cm. It can be used immediately when unfolded, and can be cut to fit your height and purpose. It can be folded up to a compact size (approx.) 13 x 12 x 55cm, making it highly portable. The main body weighs about 410g, surprisingly light and ultra-lightweight. It can be folded in seconds in a simple form and attached to the outside of your backpack for easy carrying. An aluminum film is vapor-deposited on the surface, which can reflect heat from the body, increasing the heat retention compared to the normal version. For maximum warmth, use with the silver side up. When mountaineering or camping, especially when weight reduction is required, you can put the mat under your body and sleep comfortably. It can be used outdoors, and can also be used as a cushion even when placed on hard ground. You can sleep comfortably even on bumpy ground with stones and tree roots by putting it under your sleeping bag. At home, you can use it directly as a bed by placing it on the floor when guests suddenly arrive. Tips: 1) The unfolded size of the mat body is measured at (approx.) 55cm x 183cm, but the actual usable size will be slightly smaller. 2) Regarding the mat thickness, the usable thickness is about 18mm, the material thickness is about 9mm, and the edges are about 4mm due to high pressure processing by machine. Please understand this before purchasing.