I have alot of the old poly/cotton blends. That is what I let the grandkids use to make charity quilts. Years ago, that was all most of us used. It lasted forever, but when mixed with cotton, the cotton falls apart first. I have been tempted to replace some embroidered cotton blocks because the poly/cotton still looks so good, and the cotton embroidered blocks were falling apart. No, I guess I am too lazy for that.