Spa Leaf Comforter King

A comforter with a 500 fill power means that each ounce of down fills 500 cubic inches of space, and the higher the number of the fill power the higher the quality of the down.
Down Comforter: To measure the amount of space in down, you take one ounce of down and compress it and then, when released, the down will expand, and the amount of space it fills up is then measured in cubic inches.
Fill power refers to the amount of empty space that one ounce of down can expand to fill, measured in cubic inches.
Larger down bunches are able to fill more space and provide more insulation with less weight which make for a loftier, warmer, more breathable comforter.
Fill power measures the amount of space in one ounce of down.
Comforters that weigh less occupy less space.
Fill Power: The space one ounce of down occupies in cubic inches (800+ is for superior quality comforters, 700+ is for excellent quality comforters, and 600+ is a good quality comforter).
Higher fill power comforters are warmer because the down takes up more space so it is able to trap more warmth.