According to the labels, poly felt is washable, not sure how ironable it is. here's a description of thermolam from the web address:
http://www.createforless.com/Pellon+.../pid76117.aspx
Pellon Fleece is great for all kinds of crafts and home decor. Fusible Thermolam Plus 44"x 20yd White- An extra lofty, needled fleece with fusible adhesive on one side. Great for crafts, accessories and quilting. Use when you want more body in diaper bags, tote bags etc. Machine washable, low dry or dry clean. 100% polyester.
So, this is needle fleece and gives body but not stiffness like the craftfuse and stiff type of interfacings.