External Cover Material: 210T Nylon, and Breathing Fabrics; Primer Material: 190 T Polyester Pongee; Fill-Material: Empty Microfiber. 5 ℃ to 25 ℃ nominal temperature that allows the sleeping temperature even at 40 ℉. The comfort temperature is 17 ℃ to 24 ℃. Even with backpack, even at home, perfect for camping and walking. Absolutely the sleeping bag for adventures. Fantastic dom with special design. 29.5 W and 86.6 hours inch meter. It fits perfectly for an average adult and tons of fields for children. The two -way zipper can often reveal your feet and can be opened completely as a blanket. . Ultra is light and easy to pack. It can be packaged in an ultra -compact bag in seconds. Just fill it in a solid transport bag, pull the straps and fold a small, light three -pound package that will easily fit into any backpack. It comes with a travel -friendly carrying bag, which makes it very suitable for storing and transportation. It can be easily cleaned or washed the machine, which can be made versatile and useful. We are struggling to provide customers the experience. If any problem needs to be solved, please do not hesitate to us. Thank you!