Not recommended for masks

Pellon® 70 Peltex® Ultra-Firm Sew-In is an ultra firm, smooth, heavyweight, sew-in stabilizer for extra support. It is excellent for accessories, crafts, home decorating, and quilting. Peltex® is easy to sew, even when sandwiched in between other fabrics. It will not flatten or distort with steam pressing. It has no grain and can be cut in any direction.