The mostly manmade category indicates that these fibers are polyester, acrylic, Orlon, and other manmade fibers. They generally contain less than 30% of any natural fiber such as wool or rayon. As these are reclaimed fibers they often were obtained without a label. If they were not labeled they were burn tested and determined to be manmade materials. If you need something that is specifically wool or silk free, please message me and I can work with you to make the best choice.