Used only 2-3 times for camping and has been stored ever since. Type: Mummy type Product Description: ● This sleeping bag provides insulation down to -10 degrees Celsius, making it sufficient for high-altitude winter campsites. It can also be used as a mattress in the summer, providing peace of mind throughout the seasons. ● The four-layer construction, with two layers each on the top and bottom, enhances heat retention. The insulation effect remains consistent even with prolonged use. ● The thicker fabric around the neck improves comfort. The YKK two-way zipper is smooth and allows for full opening. ● The chest area is designed to be spacious, allowing for easy turning over. ● DuPont's seven-hole fiber is used as the filling material, providing a soft touch, like a home futon. ● It comes with a windproof flap, and an inner pocket can store a mobile phone or wallet. The collar area further enhances heat retention. ● The included compression bag allows for compact storage of the sleeping bag. ● This product cannot be tumble dried. After washing, please hang it to dry before storing. Product Details: Size: 215 x 85 x 60cm (when stored: 37 x 25cm) Outer fabric: 40D nylon ultrafine fiber Inner fabric: Ultrafine fiber Filling: DuPont seven-hole fiber Total weight: Approximately 1,900g ± 5% Cold resistance temperature: -10℃ Care Instructions: When washing in a washing machine, wash one at a time and set the spin speed to the minimum (gentle wash mode).