Agree with others that batting is preferable. You also might like to try the double fusible stiffer batting found in these Craft-Tex mats...makes it very easy to make placemats (steam iron twice to adhere fabric on each side). There are many sources for these, including LQS, but here is one for illustration:
http://www.anniescatalog.com/detail....FcZQ7AodUFQAWw