I've had to make a few (summer/warm climate) quilts over the years ... Family in Florida and San Diego ... Flannel makes for a pretty warm quilt! So I have had to do some experimenting . the best results came from the ones with just regular cottons top & backing and a layer of lightweight fusible interfacing (fused to the back of the top) and quilted. The one I made that needed to be a bit *loftier* I used wool batting in And, the summer quilt on my bed has wool batting. The great thing about wool batting is it is lightweight, breaths, and has great loft. It is definitely a favorite.