
Uncover the Inner Filling of Outdoor Sleeping Bags
The filling of outdoor sleeping bags is of great importance. Here is a detailed introduction about it:
Importance of Fillings
① Key to Thermal Insulation Performance: The filling is one of the core elements that determine the warmth retention level of a sleeping bag. In the outdoors, especially on cold nights, good fillings can effectively prevent the body heat from dissipating outward, creating a warm micro-environment and enabling users to sleep comfortably. For example, when camping in high-altitude mountainous areas, a sleeping bag with poor thermal insulation will make people shiver and have difficulty falling asleep, while a sleeping bag with high-quality fillings can withstand the severe cold.
② Impact on the Weight of Sleeping Bags: Different fillings have different densities and weights. For outdoor activities such as hiking and mountaineering that require carrying equipment over long distances, lighter fillings can significantly reduce the overall load, enhancing the convenience and comfort of travel. For instance, some ultra-light down-filled sleeping bags are the top choice for many lightweight outdoor enthusiasts.
③ Relevance to the Volume of Sleeping Bags: The compressibility of fillings varies greatly. Good fillings can be compressed into a very small volume when stored, which is convenient for carrying and storage and saves backpack space, thus leaving more room for other important outdoor equipment, such as tents and cooking utensils.
Common Types of Fillings
① Down Fillings
Goose Down: Goose down is a highly favored high-end filling material. Its down clusters are relatively large and plump, with a high down content and excellent loft. Generally speaking, high-quality goose down sleeping bags can have a loft of 800 or even higher. For example, when camping in the snow with a temperature of minus ten or more degrees Celsius, using a goose down-filled sleeping bag with a loft of 850 has a very good thermal insulation effect. Moreover, goose down has an excellent warmth-to-weight ratio and is much lighter than many other fillings under the same thermal insulation level.
Duck Down: It is more affordable than goose down. However, its down clusters are usually slightly smaller than those of goose down, and its loft is generally a bit lower. The loft of common duck down sleeping bags may be around 600 – 700, and its thermal insulation performance is slightly inferior. But it can also meet the thermal insulation needs of many conventional outdoor environments and is suitable for use in spring and autumn or in mountainous areas where the temperature is not particularly low.
② Synthetic Fiber Fillings
Polyester Fiber: This is the most common synthetic fiber filling material. It is inexpensive and easy to maintain. It can still maintain a certain thermal insulation performance even when it gets wet. Although its compressibility is not as good as that of down, it can also meet the basic storage requirements. Some entry-level outdoor sleeping bags are often filled with polyester fiber and are suitable for use in outdoor environments in summer or where the thermal insulation requirements are not high, such as camping in urban parks.
P棉 (Primaloft): It belongs to high-performance synthetic fibers and has good thermal insulation properties. It can still maintain a relatively high thermal insulation efficiency even in wet environments. Its thermal insulation ability is close to that of some mid-to-high-end down products. Its compressibility is also relatively good. It is often used in outdoor adventure sleeping bags that have requirements for waterproofing and moisture-proofing. For example, it is quite suitable for camping in wet jungle environments.

③ New Materials (Aerogel Fibers)
Qingfeng Yunrong: It adopts aerogel fiber technology and belongs to high-performance synthetic fibers. Thanks to the properties of aerogel, Qingfeng Yunrong performs excellently in outdoor sleeping bag applications, surpassing goose down in aspects such as thermal insulation, moisture resistance, and sterilization. The production cost for enterprises and the cost-performance ratio for users are also quite impressive. Currently, the product application of Qingfeng Yunrong is looking for partners at home and abroad, and more expansion applications are in the outdoor field. Besides filling applications like Yunrong and flocculent pieces, there are also supporting products such as aerogel fabrics.
How to Choose the Appropriate Fillings
Consider the Ambient Temperature of Use: If camping in cold winters or extremely cold high-altitude areas, then priority should be given to sleeping bags filled with Qingfeng Yunrong or high-loft down fillings. If it’s in the relatively mild spring and autumn seasons, synthetic fiber-filled sleeping bags or medium-loft down sleeping bags can meet the requirements.
Budget Factor: Down-filled sleeping bags, especially those with high-quality goose down, are relatively expensive. If the budget is limited, synthetic fiber-filled sleeping bags are a more economical choice. They can also ensure the basic thermal insulation needs for outdoor sleeping to a certain extent. The emergence of Qingfeng Yunrong has further filled the gap caused by the budget factor. It can achieve perfect outdoor camping while maximizing the cost-performance ratio. In this regard, Qingfeng Yunrong is the top choice.
Travel Mode and Requirements for Weight and Volume: If traveling by car, the requirements for the weight and volume of the sleeping bag are not so strict, and you can choose relatively thick but possibly heavier and larger sleeping bags with fillings. However, if traveling by hiking, cycling or other ways that require carrying equipment, it’s best to choose sleeping bags with lightweight and easily compressible fillings. Down-filled sleeping bags will be more suitable. In this regard, whether traveling by car or on foot, Qingfeng Yunrong is also the top choice.
In conclusion, understanding the relevant knowledge of outdoor sleeping bag fillings can help outdoor enthusiasts choose the most suitable sleeping bags according to their actual situations, so as to better enjoy outdoor camping and other activities.
If you are a manufacturer related to outdoor camping products, you are welcome to contact us. We are a professional manufacturer of aerogel fibers, with products covering aerogel fibers, aerogel fillings, aerogel yarns and aerogel fabrics.
Appendix: Test Report of Qingfeng Yunrong