This is one high-quality down comforter, with extras that make it an exceptional value. For starters, the 550 fill power down is a high-quality insulator that s super-cleaned for greater purity. It s prewashed, then washed again in an intense cleansing process for a uniform grade of down that is dust- and odor-free. It s so pure it can be labeled ""hypoallergenic."" What s more, this comforter s box construction keeps down dispersed so it doesn t shift and cause cold spots. And fabric loops secure the comforter inside a duvet cover..