Pellon® SF101 Shape-Flex® Cotton Woven Fusible Interfacing 20" x 10 yards Bolt. Color: White. Fiber Content: 100% Cotton. Application Method: Fusible. Shape-Flex® is 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. Shape-Flex® is intended for light to medium woven and knit fabrics, including oxford cloth, chambray, gingham, madras, tattersall, pincord, flannel, and polyester/cotton blends.