And in the corners, you’ll find loops to attach an outer duvet cover if you choose! On the inside, you’ll find high-quality down clusters. Because this is a down comforter, the fill is down feathers. These feathers are responsibly sourced from Hutterite farms in Canada. These farms never engage in live plucking, and they wash the down clusters before use. Typically, comforters have something called fill power. This term refers to how much loft an ounce of down can fill up space. The Brooklinen comforter has a 700 fill power, which is on the higher end.