Heavy Duty Wonder-Under is a 100% Clear Polyamide Paper backed fusible web with double the adhesive of regular Wonder-Under. Use on appliques and hems in denim, canvas and other heavy fabrics. Fuse fabric to fabric or other porous surfaces. The paper backing eliminates the need for a separate transfer sheet. Item offered is 5 yards of interfacing, which measures 17" wide x 5 yards in length.