I have always heard that you should not wash precuts...even flannel ones. I think someone on this board posted that. I don't know the answer to woolie flannel but here is what I found out about it:"Looks like wool, feels like wool, yet sews and washes like cotton with no scratchy wool itch. Woolies flannel is comfy-cozy perfection with classic designs like herringbones, plaids, tweeds & dots in a rich array of home-friendly colors."