60 wt. 2-ply polyester thread. Designed for applique, bobbin thread, and quilting. Lint-free never felt so good. The Bottom Line makes a fantastic bobbin thread for any type of sewing. Its lightweight, blending colors are easily matched with any top thread. Invisible applique and binding is a breeze with Bottom Line as it glides through layers of fabric. Bottom Line is fantastic for micro-stippling and English Paper Piecing.