I purchased this in 2025, but I don't think I'll be using it, so I'm putting it up for sale. I've only used it once at home, so it's practically new. Description is quoted below. arata ASP-R7 Mummy Combines light weight and a high R-value, suitable for -30°C environments. An all-season air mat that's a perfect match for the Japanese mountain scene. The ASP-R7 is designed for the major mountain scenes in Japan, an all-season air mat that can be used even near the summit of the Northern Alps in the dead of winter. It achieves high performance and a comfortable sleeping experience. The Mummy weighs approximately 477g. The arata ASP-R7 series is a high-performance air mat series designed for use at 3000m altitudes in the dead of winter. ● Specifications designed for use at 3000m altitudes in the dead of winter The minimum temperature often reaches -25°C near the summit of the Northern Alps in the dead of winter, so the R-value is set to R6.5, which corresponds to -30°C with a certain buffer. The air mat structure uses a multi-layer structure that combines TPU film and heat-reflective PET film. This structure has the advantage of increasing the amount of air inside the mat as the mat becomes thicker, which increases the R-value, but it also has the disadvantage of making the surface uneven in proportion to the thickness, making the sleeping experience worse, and increasing the weight due to the increase in materials. Even if a product is lightweight and easy to carry, it's pointless to bring it if it's not comfortable to use when sleeping. The ASP-R7 Mummy doesn't excessively pursue weight specifications, and it also considers comfort, with a shape that secures a place for your feet. ● Simple pump sack ● Includes two 7cm square repair sheets Includes two 7cm square TPU repair sheets. - arata ASP-R7 / Mummy - Dimentions：183 x 51 x 10 cm Body weight：477g Material：20D Nylon Ripstop R-value：R6.6 Accessory： Pump Sack / Storage bag / Repair seals x 2