My favourite is Quilters Dream Orient which is a bamboo mix, followed by Quilters Dream cotton - all three weights, depending on the quilt.
Unlike Warm and Natural, it doesn't use a polymer base. I once used Warm and Natural on a pale quilt I quilted on my LQS Gammill and didn't notice they loaded it on the wrong way, so the little cotton seeds showed through. So, between that and the polymer, I haven't used it since.
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