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A construction of a down jacket or a sleeping bag (as well as other down products like mitts or booties) is based on the one of a vacuum flask – it is the air captured inside the construction that insulates us rather than the material itself.
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Materials used for making down accessories and clothes should comprise with several crucial parameters. It is important for them to breathe, to hold the down well, to be windproof and resistant to mechanical damage. Additionally they should be reducible to smaller sizes (for packing) and, in the same time, be maximally springy (the fabric mustn’t crash the down with its own weight).
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