Gütermann creativ Extra Strong is the right thread for all seams subject to high wear and tear. But it is also very suitable for repairing and sewing jeans. Applications... for all heavily-stressed seams ideal for the sewing of jeans material (also in special jeans stitching colour No. 448) specially suitable for rugged repair work for heavy woven fabrics, leather and canvas covers especially tear-resistant elastic and soft recommended needle and needle size: Universal Needle NM 70 - 110 Material... 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. OEKOTEX 100 certified Care Instructions... Normal Wash 95 Degree C No Chlorine Bleach Normal Tumble Drying Hot Ironing Dry Cleaning