Ⅰ. Keep you cozy: Keep you warm up to 77°F. Ⅱ. Waterproof & Comfortable: The outer shell material is 170T nylon, which is a waterproof and breathable fabric. The lining material is polyester. Our sleeping bag is filled with 100GSM elastic & Alternative hollow microfiber. The material is soft, comfortable and breathable, and it quickly deflates to make the sleeping bag fluffier and warmer. Ⅲ. Compressed bag: Sleeping bags for camping have a convenient inner pocket for items on the lining to store your belongings and an external compressed storage bag. Ⅳ. Zipper: Fully expandable sleeping bag that can be opened directly as a duvet cover or as a sleeping bag Ⅴ. Keep cozy: Stay warm even in temperatures up to 77°F. Ⅵ. Waterproof and comfortable: The outer cover material is waterproof and breathable fabric. The lining material is polyester. The material is soft, comfortable and breathable, and it quickly turns over to make the sleeping bag fluffier and warmer. Ⅶ. Compressed bag: Sleeping bags for camping have a convenient inner pocket for things to put your things and an external compressed bag. Ⅷ. Zipper: Fully expandable sleeping bag that can be opened directly as a duvet cover or as a sleeping bag