As for the synthetic lining, it now serves both the sleeping base than the one used in the high mountains. It is used today for the majority of bags. Although the characteristics of certain fibers used to match the thermal qualities of the real down, synthetic bags remain generally heavier.
For the same packing, according to the techniques used in manufacturing, will result in different performance.
The “classical” system is the simplest, least expensive but also the least effective. In this case, seams through both walls of the fabric thereby creating cold spots. To overcome this disadvantage, some manufacturers rajoutent an outer shell fabric without seams.
Systems with double or triple autonomous partitions (two or three bags one inside the other) are the most effective though heavier contrary. This is the method used for sleeping in extreme conditions.
As for the fabrics used, each course has specific characteristics: weight, waterproof, tear resistance, etc., which of course will affect the thermal quality of the bag, as well as its weight or its price.
This is the rectangular sleeping bag, with or without hood, which can be opened completely to form a blanket. These bags are more but generally heavier and bulkier than the sarcophagi. But equal qualities, they are also often cheaper.
It corresponds to duvets narrowed in the feet and equipped with a hood. Some, called “anatomical sarcophagus”, completely conform to the shape of the body thereby increasing the performance of the bag. More adapted to carry and warmer equal characteristics as the precedent, “sarco” are often popular with hikers and mountaineers.
A report that whatever the shape and patterns, most of the time the bags are twinned them (hence the lack of interest to invest in a two-seater).
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