I have a pieced flannel quilt made with warm and natural batting and a flannel back. It is king size and it weighs a ton.

If it's the weight go with flannel, maybe as a backing. I made a flannel rag quilt from 3 layers of flannel and it's very heavy compared to any of my quilts with a cotton top and back and layer of cotton batting.

My great grandmother used old wool army blankets for batting. I don't know how she acquired them, they were stamped U.S. Calvary - she worked as a seamstress before she got married and was very resourceful when it came to using hat she had to make something she needed. She lived in Kansas, Oklahoma and Colorado where you need very warm bedding. She lived from 1875 to 1961. When I was little and stayed with her in Burlington KS I loved using those quilts.

I made a twist and shout and it is really heavy I mean heavy!!!!

I wanted the loft to accent the quilting on Summer in the Park (Missouri star pattern) I used two layers of Warm and Crafty (I think that was the name of it. purchased as a whole bolt at JoAnns) It is a low loft poly that was pretty compact. That quilt is pretty heavy. I like it, but I am glad its just a lap quilt.