Hobbs Polydown has nice loft and is puffy. Quilting must be done a minimum of 4" apart. Wool is another option but carries a very hefty price tag. Again Hobbs makes two wools. The most commonly found is Hobbs Heirloom washable wool. Also requires quilting spaced at 4" minimum.
Quilters Dream also carries a wool bat and a high loft poly called Dream Puff.