It's the sizing. My youngest has allergies to alot of sizings. I never prewash, unless the project is for her, or a bed quilt that's staying here. she can go thru my stash, not a problem, as it's short term. But more than a few min. it's got to get washed. FQ's are done in the sink, yardage in machine. Only damp dry them, press them dry.