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Similarly, it is asked, what does fill power mean?
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 air a certain weight of the down can trap, and thus the more insulating ability the down will have.
Additionally, what does fill power mean in coats?
Down fill power is a measure of the loft or 'fluffiness' of the down and its insulating properties. The higher the fill power, the more air pockets in the down and the more insulating the jacket will be for its weight.
A jacket with 300g of 550 fill down, for example, will provide more warmth than one with 120g of 800 fill down. However, it will obviously weigh a lot more! Slightly lower fill power down (i.e. 650-700 fill power) is sometimes used in high-contact zones of some active garments.