Skin friendly durable material: The sleeping bag is lined with a soft, lightweight polyester fabric with a breathable texture. Frosting technology improves the comfort of the ultra-light sleeping bag liner, prevents wrinkling, pilling, fading and other problems, and guarantees the life of the sleeping bag. User-friendly design: The lightweight travel sheet has a button at the top that opens on one side, allowing you to effortlessly slide in and out of your sleeping bag filled with cotton. The invisible zipper at the bottom provides ventilation options and freedom of movement for your feet. If you feel hot while sleeping in your sleeping bag, you can open the bottom zipper. Versatile companion for sleeping bag: Warm sleeping bag liners can be inserted into winter sleeping bags, allowing you to clean the liners instead of the whole sleeping bag. It provides extra warmth during winter camping trips. In addition, the lining can be used independently as a summer sleeping bag, suitable for all seasons. One-piece pillowcase: The zippered sleeping bag is lined with a convenient pillow bag that allows you to tuck your coat into a comfortable pillow while camping. When traveling, you can use pockets to store hotel pillows separately and sleep more hygienically. Lightweight and easy to pack: The sleeping bag lining measures 70.9 x 82.6 inches (180 x 210 cm), and it easily folds into a compact 9 x 9.8 inch (23 x 25 cm) pocket, making it easy to carry and travel. It saves space in the backpack. Practical comfort: Breathable self-drying sleeping bags effectively protect your bed, pillows and sheets from lotions, mousses and other self-drying products, while ensuring your ideal self-drying results; In addition, they allow you to move flexibly indoors, making your tanning experience and sleeping time more relaxed and enjoyable