COATS&CLARK-Dual Duty XP Heavy Weight Thread. This thread was designed to meet the needs of sewers when it came to denim double knits drapery fabric faux fur felt fleece leather and faux leather quilted fabrics sweater knits ticking twill upholstery canvas duck and sail cloth. Recommended needles: Machine: 14(90) 16(100) or 18(110) Hand: sizes 1 to 6. This thread is ideal for bold topstitching cording and stitching hand-worked buttonholes. Obtain a smooth & beautiful finish consistent tension balanced twist excellent stitch formation low breakage color-fast and weather resistant with this unique polyester wrapped core spun thread produced using a new advanced spinning technology. Spool features the dual-trap system for a more secure storage without the spool unwinding.