Pellon SF101 Shape-Flex Woven Fabric Interfacing. Color: Black 20 x 25 yd By the Bolt. An all-purpose woven fusible interfacing. It provides crisp support for collars cuffs yokes pockets facings and other detail areas of a garment. It can also add body and permanent stability when used as a backing for needlework and punch embroidery. It is intended for light to medium woven and knit fabrics.