For all heavily-stressed seams. Ideal for the sewing of jeans material. Especially suitable for rugged repair and upholstery work. For heavy woven fabrics, leather and canvas covers. Especially tear-resistant. Elastic and soft. Can be used with a fine needle to protect more delicate fabrics. Recommended needle and size: Universal, size 70 - 100. Thread thickness: No. 40. 100% polyester. Manufactured using energy efficient Micro Core Technology. Creates a thread of a consistent quality that is strong, tear resistant, lint free, soft and smooth.