100% polyester batting. Soft cuddly poly, loftier look. Thermal bonded batting, easy to handle. Hand or machine quilting.
Hint: When looking to purchase a book on-line, if you go to the publisher and type in the title, you can generally see all the projects in the book. For example: Shopmartingale.com, or C&T Publishing. (Patchwork Place books are part of Martingale Publishing.)