This is a mont-bell sleeping bag, the "Super Stretch Burrow Bag #3". It's a mont-bell synthetic fiber sleeping bag suitable for three seasons. It uses mont-bell's original hollow polyester fiberfill (Exceloft), which is a complex blend of different thicknesses that warms the body and dries faster than down. It has horizontal stretch, so it doesn't feel constricting while you sleep. The color appears bluish due to the lighting, but it's closer to the last photo. Comfortable sleep temperature: ~0 degrees Celsius. Limit of use temperature: -10 degrees Celsius (according to specifications, individual differences apply). It has been used only a few times, so there are no visible stains, frays, or tears. However, it is a used item, so please understand this. Those who understand and are familiar with this item, please consider purchasing. It sells for around 8,000 yen online. Size: Maximum length 209cm x maximum width 98cm, Suitable height: up to 178cm, Weight: 1.23kg ●Materials: Fabric: 100% nylon, Insulation: 100% polyester (Exceloft)