I've made 33 quilts from there fabrics and 33 from my own stash for QFK. The fabric that I have gotten from them have never been washed so I'm sure I didn't have to prewash mine before I made the quilt from my stash. I think it's a great cause but none that I've made stays in my state. But it doesn't matter....sick kids are sick kids where ever they are. I love to be able to give a simple quilt to make a hospital stay for a child better.