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　　An important indicator of choosing an outdoor sleeping bag is cold protection and heat preservation. At present, there are two main types of fillings for outdoor sleeping bags, down and chemical fiber cotton, and there are also single-layer fleece sleeping bags. Users can choose sleeping bags of different materials according to the season of use and outdoor temperature.

　　down sleeping bag

　　It is further divided into duck down and goose down. Under the same conditions, goose down is slightly warmer than duck down. Down has three main performance indicators: the first indicator is the filling weight, such as 400 grams of goose down sleeping bag, 1100 grams of duck down sleeping bag, this weight is not the weight of the sleeping bag, but the net weight of the filled down; the second indicator is the down content Quantity, down is composed of pinnae and velvet, the pinnae has a supporting function, and the warmth mainly comes from fine down. Cashmere content is expressed by percentage, such as 80 cashmere means 80 units of cashmere in 100 weight units. Duck down generally has a high down content of 85 to 90, and goose down has a down content of 90 to 95. The third indicator is the expansion degree of down. Inches, the higher the expansion of down, the better the thermal performance of down. Generally, the expansion degree of domestic duck down is about 450, and that of domestic goose down is from 450 to 600. The down content of Andean goose down imported from the United States can reach about 95%, and the expansion degree can reach as high as 700 to 800%.

　　Sometimes you can find very cheap down products in the market, such as 100 yuan a down sleeping bag, 150 yuan a duck down sleeping bag, such products are generally not available. Because down has two indicators that ordinary people cannot check on the spot: oxygen consumption index and cleanliness. The down needs to go through multiple professional cleaning and degreasing procedures. Some small traders make the finished products after a little cleaning of the primary down. There will be a smell when you smell it, and if you wash it, there will be a bad smell in the water. Down itself is a high-quality product, and I hope you can choose a good product.

　　chemical fiber cotton sleeping bag

　　There are many types of chemical fiber cotton sleeping bags, and the quality is uneven. From ordinary spray-bonded cotton, to four-hole cotton, seven-hole cotton, 3M Thinsulate cotton, POLARGUARD 3D/HV cotton, etc. The difference between polarguard 3d and polarguard HV is that the former is more compressible, while the latter is better at keeping warm. Generally, 3D can reach -5~-15°C, while HV can reach -15~-25°C. Like all kinds of sleeping bags filled with chemical fiber, the thermal performance will gradually decrease with the increase of use time until they cannot be used. However, they have an advantage that down sleeping bags do not have, that is, they can still retain part of the thermal performance after being wet, unlike down. Once wet, it will not keep warm at all or even have a negative effect. The filling density is expressed by the weight per meter square, such as 260 grams/meter square, 320 grams/meter square.

　　Comparing the two fillings of down and chemical fiber cotton, down has a higher degree of warmth retention, and can achieve light weight under the same degree of warmth retention; chemical fiber cotton has a relatively low degree of warmth retention, large packaging volume, and poor compressibility; down sleeping bags are expensive, while chemical fiber cotton sleeping bags are cheap; When down is wet, it will lose almost all of its warmth retention capacity, and it is not easy to dry. Therefore, in harsh mountaineering environments, materials with water release and breathability properties are often used as the outer material of down sleeping bags. Chemical fiber cotton has certain water repellency properties and maintains certain warmth retention properties after being wet. , and the drying speed is fast; the service life of down products is very long, and it can be used for more than 10 years with good maintenance, while the service life of chemical fiber cotton sleeping bags is only 3 or 4 years.

　　fleece sleeping bag

　　What is a fleece sleeping bag? To put it simply, fleece is a functional fabric made of superfine chemical fibers made into wool yarn, woven into fabric, brushed with a wire brush, and then sheared by a machine on the surface. That is, the chemical fiber that everyone hears. The advantages of fleece sleeping bags are that they are lightweight and quick-drying, with unparalleled breathability and warmth retention. Suitable for very hot weather, or used as a liner with down or cotton sleeping bags. The disadvantages are obvious, poor thermal insulation and poor compressibility under the same weight. Fleece sleeping bags are mainly polar fleece and coral fleece, but most of them are polar fleece. The choice of fleece sleeping bags depends on how many grams of fleece per square meter, and the use of sleeping bags can increase the temperature of the sleeping bag by about 2-5 degrees.