You can wash Warm and Natural to preshrink it (this is not the case with all battings). They have directions on the package. You're not supposed to spin it, but you can dry it on normal heat. What I do is soak it in a wash tub, squeeze it out, then squeeze again between two large towels, and machine dry. That said, my last quilt still seemed to shrink a bit after washing, even with the pre-washed Warm and Natural. Still, I don't know of any batting that doesn't shrink somewhat. The wools seem to claim the least shrinkage, when washed in cold and air dried.