Polyester Thread
Polyester is rapidly catching up to the popularity of Rayon threads for embroidery. It is a very strong and economical thread. Polyester embroidery threads won't fade or shrink in the wash.
The luster, or sheen, of polyester thread falls between that of cotton and rayon.
Polyester threads do have some give or stretch to them.
Polyester embroidery threads are available in a wide range of solid and variegated colors. Like Rayon, the most popular thread size is 40wt, but 30wt and 50wt can be easily found.