From my professional long arm, when I was making the OSU quilt. I put in 80/20 batting and grey fleece (on sale at Jo Ann's) and she said that it would work beautifully because she had been doing it for a number of quilters in our area. She said wears well and washes well. We put the quilt on the bed when the cold snap came a few weeks ago and it was wonderful. It is heavier in total but once on the bed, it was snuggly warm. And the long-arm quilting on the back is beautiful. Then I made a baby quilt with a patterned block fleece (in all the pastel baby colors) backing and hand quilted it and it turned out beautifully also.