Pellon 950F ShirTailor is a firm, fusible, non-woven interfacing that is ideal for stabilizing shirt collars and cuffs. It gives a crisp, smooth, neat, professional look. ShirTailor is best used with light to mid-weight woven and knit shirtings, including oxford cloth, chambray, gingham, madras, tattersail, pincord, flannel, polyester/cotton blends, and kettlecloth. It has both a lengthwise grain for stability and a crosswise stretch for shaping. 100% Polyester. Sewing machine safe.