1. Fabric
Professional sleeping bag fabrics have high requirements, not only wear-resistant and waterproof, but also light and anti-drilling down.
Wear-resisting: not wear-resisting, running fleece after several times of use, the warmth retention will be greatly reduced;
Waterproof: Outdoor camping, the water vapor exhaled by people will condense into water or thin ice when it is cold, and the sleeping bag fabric will not be waterproofed, which will wet the sleeping bag and affect the thermal insulation effect;
Light and thin: Mountaineering and hiking are very exhausting. If it is still heavy, then…
Anti-drilling down: running down all the time, the warmth gets worse and worse; generally, high-density nylon above 200T is used to avoid running down.
In addition, the fabric should also form a partition system to fix and evenly distribute the filling to prevent cold spots, so that the sleeping bag has a good thermal effect. ps: The cold spot is not covered with filler, and the cold air will drive straight in.
There are several ways to divide the partition (left side), and high-quality sleeping bags will use a variety of ways to divide the warehouse (right side), so as to have a good thermal effect.
2. Filler
The size, weight, and durability of sleeping bags are closely related to the filling. There are two types of fillings, down and rayon.
a. Down
At present, down is the best thermal insulation material. Of course, down sleeping bags are also divided into good and bad, which can be distinguished from the three indicators of down content, bulkiness and down filling. In addition, goose down is generally better than duck down, goose down has a higher bulkiness and less flavor.
Down content: Down contains feathers and down. The ratio of down and down is called down content. The higher the down content, the warmer it is.
Bulkiness: The volume of an ounce of down, the higher the bulkiness, the warmer it is and the better the compressibility. The amount of down filling: the total weight of the down filled down. Generally, the heavier it is to keep warm, but too much filling will also reduce the bulkiness, so it should be considered comprehensively.
b. Artificial cotton
Not only is rayon heavy, but its warmth retention will be worse and worse, and its service life will be short. It is not recommended for high-altitude camping.
3. Zipper
It’s too important, I can’t even think about it when the zipper is broken: long nights, cold wind blowing, can’t sleep…
