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Feathers and down as filling material The following factors determine the quality of feather and down (separately or blended together): light weight and fill power, compressibility and elastic recovery, hygroscopicity, insulation, physiological and comfort.
Compressibility and elastic recovery: Feather and down material is highly compressible
given the great amount of air it can retain and its capacity to
be restored to its original shape and volume.
Physiological properties
and comfort: The capacity to absorb moisture is a very important
physiological factor as it allows it to wick away from the body.
Given its morphological characteristics, the filling
can retain great volumes of air.
Quality of the products > Quality in practice > Filling material |
1
gram of down can fill a volume of 0.4 litres. 
