An important factor that you shouldn’t forget to consider when you’re shopping for a comforter set is its fill power which is the amount of space 1 oz. of down takes up if it’s allowed to reach the maximum loft. To give you an example, 800 fill power implies that 1 oz of down can loft approx. 800 cu. in. Basically, the higher your comforter’s fill power, the fluffier and softer it will be.