Isacord embroidery thread is the number one choice for many of the largest embroidery operations in the world. Its high quality and strength will help maximize your production ability. Polyester thread is nearly twice the strength of rayon thread. Isacord Thread is proven to be the smoothest running and most reliable thread in the embroidery industry. Isacord thread is made in Germany from only the finest raw materials to provide just the right amount of elasticity to allow for high speed running without looping or puckering while nearly eliminating thread breaks.