This what Hobbs had to say when I googled it...
Layer your quilt top, batting and backing. To fuse all three layers of your quilt at once, set iron on a wool or cotton setting with steam. Simply press quilt from the center to the outer edges. Be sure to keep your iron moving, pressing approximately 2-3 seconds in each area.
FAQs - Hobbs Batting
<cite class="_Rm" style="color: rgb(0, 102, 33); font-style: normal; font-size: 14px;">www.hobbsbatting.com/resources/for-quilters/faqs/
Watson</cite>