You'll find all the high-quality effort we put into every Duck Down Comforter here — and then some! 650 fill power duck down is an exceptional grade 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 free and odor free. So pure, it can be labeled "hypoallergenic". What's more, this comforter is constructed with internal baffle boxes that give each down plumule room to fully loft and keep the down dispersed throughout. And tabs let you use the corner ties in our duvet covers to keep the comforter in place.