Find the Pellon® SF101 Shape-Flex® Woven Cotton One-Sided Fusible Interfacing at Michaels. Pellon SF101 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.