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　　According to my experience, I choose sleeping bags according to the ease of travel. It depends on the season and the temperature and altitude of your camping place. Fleece sleeping bags are suitable for summer, spring, and early autumn. The disadvantage of cotton sleeping bags is that they are too big, which does not save space, and the thermal effect only stays at about minus ten degrees. , not suitable for high mountains and snow-capped mountains. It is a down sleeping bag, which is light, easy to carry, and has a good thermal effect. Perhaps the biggest disadvantage is that the price is relatively high.

　　At present, sleeping bags on the market are divided into down and synthetic fiber sleeping bags (usually cotton sleeping bags) according to their materials.

　　down sleeping bag

　　The material of down can be divided into white goose down, white duck down, gray duck down, waterfowl down and so on. The warmth per unit weight is the most effective. The down sleeping bag is warmer, easy to squeeze, easy to keep the original shape, and has a longer service life. The disadvantage is that the price is higher, it will absorb water, and the warmth of the wet sleeping bag is quite poor, unless It takes more than one day to dry in the sun. These characteristics are deeply doubtful for choosing feather sleeping bags in humid environments. High-quality down sleeping bags are properly maintained and their service life is three times longer than that of synthetic fibers. There are three basic stitching methods for down sleeping bags: (1) sewthrough, (2) slanttube, (3) overlappingtube. The first stitching method is simple and not complicated, but the heat energy is easily dissipated from the stitching thread. The second stitching method is most common. Sleeping bag sewing. This method allows cold air to escape from the sleeping bag. The third is the ideal method. This sleeping bag is more expensive. Most sleeping bags are designed with channelblocks, which prevent the feathers from moving around.

　　synthetic fiber sleeping bag

　　Synthetic fibers have better moisture resistance, and wet sleeping bags can still maintain warmth, quick drying, low price, but slightly heavier than down sleeping bags of the same level, not easy to squeeze and pack, take up space in backpacks, and have a shorter service life. Synthetic fibers Divided into two different fibers. (1) Long fiber: There are many products of this kind of fiber. The sewing method is like the wave overlapping type of asbestos tile roof, covering the cold place. (2) Short fiber: The sewing method is double or three layers such as sparse Only thin cotton cloth is used. There must be a gasket design beside the zipper to avoid heat dissipation. If two sleeping bags need to be combined, pay attention to the gaskets on both sides. There are different types of synthetic fibers.

　　Hollofil: A low-priced polyester product, it is divided into two systems, (1) HollofilII fiber, fiber smooth, elastic and folding are improved, (2) Hollfil808 improves smoothness.

　　Lamilite: Wiggy's product is composed of multiple layers of thin layers. The sleeping bag is thinner and can maintain warmth even in humid environments. It is lighter in weight and lower in price. This fiber improves the smoothness and folding of the filling and can resist the use of washing machines. destruction.

　　LiteLoft: 3M's product is made of microfinepolyester/olefinfibers thermally melted to form lattice-like fluff. It is found to be warm, soft, and extrudable, but it seems to be worse than other materials after one year of use.

　　Microloft Polarguard: Hoechst-Celanese's product, one of the initial development of synthetic fiber products. The current improved PolarguardHV new product is 25% lighter than the original Polarguard. The early response to HV is lighter, fluffier, and much smaller in size, but the long-term durability is still a question mark.

　　Primaloft: This fiber imitates the appearance of bird feathers. It is slightly harder and thicker, making it difficult to make sleeping bags and the price is high, but it is remarkable for water resistance and quick drying, and its durability seems to meet the general standard.

　　Quallofil: It is a kind of short fiber and may be the mainstream in the future.

　　According to the appearance style, it is mainly divided into mummies and envelope sleeping bags. This design has a headgear, the top is large and the bottom is small, which conforms to the shape of the human body. The side of the sleeping bag is equipped with a zipper for easy access. This design has good thermal insulation performance. However, the envelope sleeping bag can generally be used by two butt joints for two people, and the zipper can also be opened to make an ordinary quilt.

　　1. Try to buy down sleeping bags. Sleeping bags filled with artificial materials are about the same size as down sleeping bags when opened, but the carrying volume is much larger. In addition, sleeping bags filled with synthetic materials are also heavier. Down sleeping bags are relatively more expensive, but they have strong thermal performance and are smaller in weight and volume than man-made materials.

　　When choosing a down sleeping bag, you can't just refer to the temperature scale, because many sleeping bags are based on the physique of Europeans and Americans. Generally speaking, Asians have relatively low cold resistance, so add 10-20 degrees to the temperature scale of the sleeping bag. Because the quality of outdoor products is uneven, everyone can buy sleeping bag covers and go to the mall to fill them up.

　　Filling a lot of down in the mall is to let unscrupulous merchants sell you duck down as goose down, and the chances of being deceived are relatively small. Duck down is cheap and goose down is expensive, but the difference in actual warmth is not very big. Generally speaking, it is enough to charge 800 grams to 1000 grams of cashmere.

　　When purchasing, be sure to choose velvet with high purity. 80%-90% purity live puller is better. Sleeping bags of American brands, those with more than 700fillPOWER belong to the fleece with very good fluffiness.

　　2. Nowadays, many sleeping bags can be used to connect two sleeping bags with a zipper to make a double sleeping bag. When shopping for a sleeping bag, buy one that zips on a different side than your partner's. Generally speaking, the man buys a sleeping bag with the zipper on the right side, and the woman buys a sleeping bag with the zipper on the left side. The sleeping bag depends on the season and the temperature and altitude of your camping place. The disadvantage is that it is too big, it does not save space, and the heat preservation effect only stays at about ten degrees below zero, which is not suitable for high mountains and snow mountains. The good thing is the down sleeping bag, which is light, easy to carry, and has a good thermal effect. Perhaps the biggest disadvantage is that the price is relatively high. It costs more than 1,000 online at minus 20 degrees, and it costs about 2,000 in physical stores, and it is still a general brand.

　　Now there are silk sleeping bags (sleeping bags filled with silk) on the market, but the price is much higher than that of chemical fiber or cotton. What's so good about this kind of baby sleeping bag? Baby sleeping bag net () to analyze. Chemical fiber fabrics have electrostatic phenomena, such as cotton and polyvinyl chloride belts, which have strong electrostatic effects, which can induce functional arrhythmia-ventricular premature beats, but premature beats will decrease or disappear when chemical fiber underwear is removed. This is because chemical fiber underwear has an electrostatic reaction after contacting the human body, which changes the biological potential of the human body, interferes with the normal electrical conduction of the heart, and causes arrhythmia. Synthetic fibers are easy to induce and aggravate skin pruritus for the elderly. Because the sebaceous glands and sweat glands of the elderly are atrophied, the secretion of sebum and sweat is reduced, the skin is dry and desquamated, and the immune function is reduced. If you wear chemical fiber underwear for a long time, due to the poor water absorption of synthetic fibers, sweat will adhere to the skin, causing microorganisms to multiply and decompose, thereby inducing allergies and eczema. In particular, trace chemical components such as raw material monomers, ammonia, and methanol mixed in the synthetic fiber production process are more irritating to people with skin allergies, especially to babies. In the manufacturing process of chemical fiber fabrics, there are more than 8,000 kinds of additives, such as bleaching agents, softeners, etc. If you wear chemical fiber fabric underwear, the chemical substances on the fabric are easily absorbed by the skin. After a long time, it will produce irritation, cause eczema, contact Dermatitis, atopic dermatitis, urticaria and other diseases. Therefore, don't wear chemical fiber clothes too much or for too long, especially underwear made of chemical fiber, and cotton underwear. People with allergies should not wear chemical fiber fabrics inside and outside. So it is not good for babies to use chemical fiber sleeping bags. However, chemical fiber sleeping bags also have the characteristics of lightness and softness, good hand feeling and cheap price.