Pellon SF101 Shape-Flex is a high-quality fusible interfacing that adds body and stability to fabrics, making it essential for structured sewing projects. Made of 100% cotton, it fuses easily with heat and provides a crisp finish, ideal for collars, cuffs, purses, and quilt blocks. Its versatility and ease of use make it a favorite among quilters, bag makers, and apparel sewists looking for clean lines and lasting shape in their work.