Vilene Interfacing Medium Weight is a fusible, nonwoven interfacing for Midweight fabrics.
It is best for use with wovens and knits such as challis, chambray, jersey, broadcloth, and linen. Fusing is not recommended for triacetate, lace, seersucker, or rainwear
Adds stability to fabrics
$1.25 for 0.5m
Sold in 1/2m increments. If you buy more than one unit it will be cut as one continuous length.
This would make an effective 3rd layer on a face mask