Polyester batting will not shrink at all. 100% cotton batting can shrink up to about 5%, and most of the cotton blends will shrink about 3%. That includes the 80-20 cotton-poly, such as Hobbs Heirloom or the Fairfield cotton-poly. The new Fairfield bamboo batting also shrinks about 3% since it is a combination of cotton and bamboo.
Happy Quilting!
Penny Halgren
www.How-to-Quilt.com
