Coats & Clark Dual Duty XP Heavy Thread is an extra strength thread that works excellently for heavy-duty sewing on upholstery fabric, drapery fabric, felt, fleece, denim, bold top-stitching, cording and stitching hand-worked buttonholes. Color-fast and very durable. This thread is weather resistant. This Coats & Clark thread provides extra strength for heavy-duty sewing needs such as upholstery, sewing on canvas, and repairs.