Fill Power is a numeric measurement that identifies the cubic inches that (1) ounce of Down occupies.
- To establish a Fill Power rating, 1 ounce of Down is free poured into a calibrated chamber or vessel.
- The more cubic inches of space (1) oz. of Down occupies, the higher Fill power rating the Down gets.
- So if (1) oz. of Down occupied 600 cubic inches of space it receives a 600 Fill power rating.
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Here is a short video explaining the difference between Down & Feather.