Inspiring Quilters, Stitch by Stitch
Il've always found polyester batting much easier to needle than the dense cottons or bamboo. A thin polyester seems puffy at first, but if you press the resulting wall piece with a medium/ hot iron, it compresses nicely and remains flat. There are thin but dense polyesters out there too, meant for table runners or crafts, but they are too difficult to hand quilt nicely. I've on occasion split a poly batting that was made in thick layers, but would not advise unless a last resort , it's difficult to get a consistant thickness.
Thanks I will go search online.