Pellon Shape-Flex Interfacing 20'' x 10 yd Bolt. SF101 Shape-Flex Fusible Interfacing is suitable for oxford cloth chambray gingham madras tattersall pincord flannel and polyester/cotton blends. This all-purpose woven fusible interfacing provides support to 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.