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Bottom Line Polyester

Threads for the Bobbin

Superior offers many different threads which can be used in the bobbin, across a multitude of Cotton, Silk, and Polyester fibers. These threads can be used in both top and/or bottom. Fiber and Weight choices are personal preference and largely depend on the desired overall appearance of the project.

Prewound Bobbins

Superior has several different brands of prewound bobbins available in three different bobbin sizes. View our Prewound Bobbin page to learn all about Superior's prewounds.

Bottom Line

Lint-free never felt so good. Designed with award-winning quilter Libby Lehman, The Bottom Line makes a fantastic bobbin thread for any type of sewing. Its lightweight, blending colors are easily matched with any top thread. Available in 55 colors. Invisible appliqué and binding is a breeze with Bottom Line as it glides through layers of.  The Bottom Line also fantastic for micro-stippling.

Kimono Silk

Kimono Silk is a very fine, 100% premium multi-filament silk.  Ideal for hand and invisible machine appliqué, detail quilting, lacework and bobbin thread.  Available in 80 brilliant solid, blending colors.


MasterPiece is nature’s finest thread.  It is certified Egyptian-grown, extra-long staple cotton and designed to create perfectly pieced seams.  With the finest spinning, twisting, and dyeing, and finishing techniques, MasterPiece has extremely low lint. You and your machine will love it. Available in 75 solid colors.


This reduced-sheen monofilament polyester is the best choice when it comes to invisible threads. Unlike other monofilament threads made from nylon, MonoPoly is 100% polyester. Commonly referred to as an invisible thread due to its fineness and reduced-sheen, MonoPoly is great for the bobbin or top. Available in two colors, Smoke (for dark fabrics) and Clear (for light fabrics). MonoPoly is ideal for invisible appliqué and quilting when the stitching is not meant to be seen. MonoPoly is recommended over nylon monofilament threads because MonoPoly will not become brittle over time (nylon monofilament thread tends to go brittle), MonoPoly will not discolor (nylon monofilament thread tends to "yellow" over time), and MonoPoly is dryer and iron safe on medium heat.

So Fine! #50

So Fine! #50 is a lint-free, matte-finish, smooth #50/3 filament polyester thread. Due to its fine nature, So Fine! #50 is an excellent blending thread and loved by both longarm and home machine quilters. Available in 134 colors, So Fine! #50 also makes a wonderful bobbin thread and is available on L and M style prewound bobbins.