Pellon® 906F Fusible Sheerweight is an ultra lightweight, non-woven, fusible interfacing for sheer to lightweight fabrics. It is great for wovens and knits such as crepe de chine, voile, and handkerchief linen.906 Pellon Lightweight NON WOVEN.
This is lightweight making it easy to fuse to the mask fabric and not appear to give bulk
Some users prefer this to allow them to breath easier
Pellon 906 Fusible Sheerweight is an ultra lightweight, nonwoven, fusible interfacing