Name: Envelope Cotton Sleeping Bag.  Color: Green.  Surface Material: 20D400T Nylon.  Liner Material: 190 Polyester Pongee.  Fill: 80g/m2 Imitation Silk Cotton.  Weight: 1600g.  Outdoor Comfortable Temperature: 5℃-15℃.  Limit Temperature: 0℃.  Size: 220*80cm.  Packing: 40x23x23cm.  Cycle time: 4~12hours (based on 10,000mAH power bank).     Material Detail: Power consumption diagram.  Please refer to the following diagram to balance the temperature control and time lasting. The diagram is based on 10000mAH power bank capacity.  Machine Washing.  Close the USB Cap before washing.     Heating Material Features: This sleeping bag is 9W power consumption and supplied by DC 5V2A power bank.Higher voltage input can damage the heating system. It warms up in seconds by the composite metal fiber heating system. The heated sleeping bag iteself can be used as a normal sleeping bag without power supply if the weather is not so cold. This revolutionary system is insanely durable and literally cannot lose conductivity unless it's cut by a machete. Special waterproof sealing is applied to heat system. Both machine washing and hand washing are acceptable.