Choosing the right sleeping bag for outdoor sports is very important

　　1. Classification

　　1. Classification according to style

　　The shape of a sleeping bag is directly related to the sleeping bag's thermal insulation effect, sleeping comfort and the volume of your luggage. The common shapes of sleeping bags mainly include the following:

　　Mummy shape: The shape of this sleeping bag is narrow at the feet, then widens up to the shoulders, and finally has an insulating and tight headband above the shoulders. A well-fitting headband should be able to be tightened to prevent cold drafts from blowing in. Moreover, considering that people's feet are most likely to feel cold when sleeping, some mummy-shaped sleeping bags are particularly thickened at the bottom, and some styles are also designed with thickened foot pads.

　　Semi-rectangular shape: This kind of sleeping bag takes into account the requirements of sleeping comfort while saving volume and weight. Most sleeping bags of this type come with a headband. In order to obtain a good thermal insulation effect, its appearance is generally relatively compact.

　　Envelope shape: This kind of sleeping bag is mostly used for outdoor camping in warm conditions. This is because the original intention of this kind of sleeping bag is to maximize people's requirements for outdoor camping comfort. The result is that it inevitably leads to more heat loss. This kind of sleeping bag can usually be unzipped and used as a cushion. This kind of sleeping bag generally does not have a special head pocket.

　　2. Classification according to material

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

　　Down sleeping bags: The material of down can be divided into white goose down, white duck down, gray duck down, waterfowl down, etc. The warmth retention per unit weight is the most effective. Down sleeping bags are warmer, easy to squeeze, easy to maintain their original shape, and have a long service life. The disadvantages are that they are more expensive and absorb water.

　　Synthetic fiber sleeping bag: Synthetic fiber has better moisture resistance and can still maintain warmth when wet. It dries quickly and is low-priced. However, it is slightly heavier than down sleeping bags of the same level. It is difficult to squeeze and fill, takes up more space in the backpack, and has a shorter service life. Synthetic fibers are divided into two different fibers.

　　Fleece sleeping bag: sewn from fleece, it can be used as a summer sleeping bag or a hygienic sleeping bag alone. It can also be used with other sleeping bags in winter to enhance the thermal insulation effect. According to time and experience, a sleeping bag with a temperature of -3 degrees Celsius can reach around -10 degrees Celsius with a fleece sleeping bag.

　　2. Five steps to choose a sleeping bag

　　Step 1: Choose a sleeping bag based on your travel plans

　　1. What is the environment like in the area you will travel to?

　　2.In what season do you usually travel?

　　3. What are the climate conditions you are likely to face?

　　Step 2: Select warmth (comfort)

　　1. Estimate the temperature conditions you will be camping at. Although this value will vary depending on the season and climate, in most cases, the sleeping conditions of ordinary travel enthusiasts are between minus 7 degrees Celsius and plus 7 degrees Celsius.

　　2. Make appropriate adjustments to the above estimated temperatures based on your personal preferences and the specific conditions you may face.

　　3. Select a sleeping bag based on the adjusted temperature value and the warmth (comfort) provided by the manufacturer. It should be noted that since the standards of various manufacturers are not uniform, the values ​​provided by the manufacturers are only a reference and are not absolutely applicable in any situation.