Down comforters are one of the more popular ways of staying warm when the chill of winter fills the air. Made from duck or goose down, they are available in a wide range of prices, depending on the type of down and the surrounding material, among other things.There are a few things you should know when shopping for a down comforter. For example, a down comforter has a fill power rating. This number corresponds to the comforter’s fluffiness -- the higher, the better. Over 800 is considered the mo.