For show quilts, I use a layer of cotton batt, with a layer of Hobbs Wool batting (lighter than air) on the top. It really defines my quilting, and the more open the quilting motif, the more fluffy you'll get. Many professional quilters use this method. I also get a great result with Hobbs Polydown, and use it mostly for quilts that are warm snuggly huggy quilts. It has a 3/8" loft and is the softest poly I've found.