This is a lightweight synthetic fiber sleeping bag, purchased new from the mont-bell online shop in July 2025 and used only twice for overnight tent camping in the Northern and Southern Alps in July and August. Even beginners to sleeping bags can easily care for it, so I think you can use it with confidence. I have washed it with mont-bell's outdoor-specific detergent for this sale, so there are no unpleasant odors or stains. Although it is a beautiful item, it has been used twice by another person, so I would be grateful if those who understand USED items would consider purchasing it. 【Brief Details】 - Color: Blue (BLRI) - Material: 30-denier Super Multi Polyester Taffeta (Outer) / 30-denier Super Multi Polyester Taffeta (Lining) / Exceloft (Insulation) - Storage Size: Φ15 x 30cm (4.7L) - Comfort Temperature: 4℃ - Suitable Height: Up to 183cm - Weight: 743g (770g) ※ Comes with a sleeping bag stuff sack. ⚠ There are no smokers in my household, nor do we have any pets.