As far as I know, adding synthetics to the mix is usually done in the case of recycled cashmere (which incidentally is becoming quite popular).By the way, inexplicable to me that they would add synthetic fibres, even in small amounts. I've also seen cashmere with polyamide and regenerated cashmere, all at the usual high prices (to me this is not attractive at all, but it would make some sense, if they would offer those things at lower prices).