Extra Strong Polyester Thread. Thanks to its balanced elasticity and recovery Gutermann Polyester Thread is perfect for sewing any kind of clothing fabric and light weight fabric like rip-stop nylons and oxfords. Each stitch is uniform and seams do not pucker regardless of if the fabric is natural, synthetic, or a blend. Gutermann is washable to 200F, shrink resistant, iron resistant to 390F, color fast and fade resistant. Its abrasion resistance guarantees durable and long-lasting seams. 100% polyester. 110yd spool.