Bottom Line by Superior Threads is a 60 wt. lint free 2-ply extra smooth filament polyester thread. Bottom Line is a very versatile thread which can be used in many applications. It?s great for micro stippling and bobbin thread when quilting. It is also great for hand and machine appliqué, embroidery, stitch-in-the-ditch, trapunto, binding, heirloom sewing, serger thread, and garment construction.