Fill power and down comforter sets
Fill power is a guide that allows you to determine how warm and how well the down insulates your down comforter sets. In other words, the fill power measures the “fluffiness” of the product. The way to calculate down fill power is to place one ounce of down in a cylinder and to record how much space it occupies. The higher the fill power, the fluffier is the down and the better it traps air, making the down a better insulator, therefore making your comforter warmer. Also, the advantage of a high fill power is that your comforter will be warmer but using less down, therefore weighing less. Fill power ranges from 175 cm³/g (300 in³/oz) (usually with feathers instead of down) to around 900 cm³/g (highest quality down).
