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The Sew-In Light Midweight Non-Woven Interfacing is from Therm O Web. Therm O Web is working closely with The Masks Now Coalition; the former has developed this new interfacing for use in the MasksNow.org 3-Layer Mask Pattern from Created for Crisis. This interfacing could also be used for other patterns calling for a lightweight nonwoven, sew-in interfacing. The Heat n Bond Sew-In Light Midweight Non-Woven Interfacing is made with 100% polyester and measures 20" wide. This product is sold by the yard.