I find that poly beards and avoid it for quilts that are going to be washed a lot. That being said - a family member made my youngest daughter a quilt using poly batt and I washed it every couple of days - that was ten years ago. It's a little dingy from being old but it's still kickin'! (She also tied the quilt - I don't know how true this is but I get the idea that the more you quilt it the more opportunity it has to beard.)