polyester thread is a 60wt/2ply. It was designed for Applique, bobbin thread, and quilting.
Superior Bottom Line thread is Lint Free. It was designed by an award winning quilter named Libby Lehman. Superior Bottom Line thread makes a fantastic bobbin thread for any type of sewing. Blending colors are easily matched with any top thread since it's lightweight.
Superior Bottom Line thread is available in 55 colors, with several of the colors matching a broad spectrum of fabric colors. Invisible applique and binding is a breeze with Bottom Line, since it can glide easily through layers of fabric without any extra friction like other polyester threads. Superior Bottom Line is also outstanding for micro stippling due to it's very fine nature.
Superior Bottom Line is available in 55 colors both cones and spools.