Scrim is a polyester grid that helps anchor cotton fibers. If you buy batting that says it's 97% cotton, it's because they've added the grid to stabilize the cotton fibers. It helps keep the cotton fibers from separating when the quilt is washed.
When you use 100% cotton batting, you need the quilting stitches close together to keep the batting from separating. With scrim added to the cotton batting you can use wider spacing between your quilting stitches because the scrim will keep the fibers stable.
Last edited by Christine-; 04-30-2012 at 06:18 PM.