Specifications: Size: Length (180cm + hat 30cm) X width 80cm,This sleeping bag is large,Suitable for most adults. Outer Shell Fabric:400T 20D Waterproof and tear resistant Nylon spinning Inner Liner material: 400T soft and skin friendly Nylon spinning Filling material:95% White duck down The foot zipper can be opened for ventilation. The hat can be removed, and when the zipper is fully opened, it can be used as a duvet or down cushion. White duck down filling material, comfortable and keep warm.Down is fluffy, sleeping bag is light, but it's warm. Down is very soft and light.There is asmall gap between down and down, which causes the air convection in the sleeping bag to be bad. It can form a layer of insulation layer which is isolated from the outside, so that the outside cold air is not easy to reach the inside, and the inside hot air is not easy to reach the outside, so that the temperature can be maintained. Use zipper of international famous brand. Durable taffeta shell that will stand up toyears rigorous use. Use waterproof fabric, light rain is no problem, of course, it is not recommended to get wet when it rains. Package include: 1 * Duck Down Sleeping Bag 1 * Storage bag Down's warm keeping principle: Down is very soft amd small, Although it looks thin,when you sleep in the sleeping bag,the down will attract your body temperature, so that the down will expand, isolate the cold air from the outside, and achieve the effect of warmth retention. It looks thin when the temperature is low,after attracts your heat,It will thicken when the temperature is high, which is normal.