Fill power is a measure of the loft or "fluffiness" of a down product that is loosely related to the insulating value of the down. The higher the fill power the more trapped air an ounce of the down can trap, and thus the more insulating ability an ounce of the down will have. Fill power ranges from about 175 cm³/g (300 in³/oz) for feathers to around 900 cm³/g for the highest quality down. Higher fill powers are associated with a larger percentage of down clusters and a larger average down cluster size.
Read more about Fill Power: Measurement, Insulation and Weight, Washing and Restoring
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