I'm always freezing at night. She loved it so much that she bought a down comforter for her sister. Hay was at an advantage when it came to choosing a down comforter because she sells them. That kind of comforter can stay on the bed year-round, and sleepers can use a lightweight cotton cover in the warmer months and a heavier flannel cover when it gets colder. Shoppers tend to underestimate a down comforter's warmth and seek out the densest one.
Fill power is measured by compressing an ounce of down and then releasing it.
The space it fills is measured in cubic inches. So 575 fill power means 1 ounce of down fills 575 cubic inches. The higher the fill power, the warmer the down. Shoppers also should compare the number of ounces of down a comforter holds. The higher the number, the warmer the comforter.