This is a mat from BROOKLYN OUTDOOR COMPANY! I bought it to save weight, but I've decided that an inflatable mat suits me better, so I'm selling it! I've only laid on it for about 10 seconds at home, and haven't used it otherwise! It has an R-value of 2.6, which is higher than Therm-a-Rest's closed-cell mats! SIZE: Approx. H1830 x W560 x D25mm Approx. W560 x 180 x 150mm (when stored) WEIGHT: Approx. 600g MATERIAL: IXPE / Aluminum COLOR: GRAY / SILVER Includes: Dedicated case BRAND: BROOKLYN OUTDOOR COMPANY This closed-cell foam mat, with its accordion shape for quick deployment and puncture resistance, is overwhelmingly supported by mountaineers facing the dangers of snowy mountains. The uniquely developed 25mm thick shape achieves a class-leading R-value of 2.6. While the sleeping comfort is firmer compared to EVA foam, it is overwhelmingly durable and excellent for use under inflatable mats to prevent punctures. Even if an air mattress punctures, you can still get minimal insulation with just one mat, providing peace of mind. IXPE, which combines lightness and durability, is used for the material. By vapor-depositing aluminum on one side, the insulation is further enhanced. The R-value, which indicates insulation performance, increases by addition when mats are layered, so it's excellent for use in combination with other mats, such as one mat in summer and two mats in winter. A dedicated storage bag is included. The high insulation R-value of 2.6, certified by the global inspection agency SGS, is the highest level among similar closed-cell foam mats. It has the performance to handle three seasons on its own. Even if the appearance is similar, the performance differs depending on the materials used, thickness, and design of the unevenness, so if an R-value is listed, it's reassuring to have a product with a certificate from a fair inspection agency.