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Subject: loft of the down poultr. Properly washed and dried down ensures maximum loft of the down. Each down cluster traps air, which increases warmth. Washing the plumes ensures that each filament can properly overlap to form a protective layer of non-conducting still air that keeps warmth in and cold out. Thus the insulation power of down fillings relies on the capacity of down to trap air. If down gets wet it clumps together, causing it to lose loft as it cannot trap air effectively. Saturated down is also slow to dry.loft of the down, down cluster как можно перевести в данном контексте. Речь идёт об очистке пуха.
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