Superior Bottom Line Thread 60wt White Polyester Bobbin Longarm

The Superior Bottom Line Thread White — 60wt Polyester is Superior’s ultra-fine 60wt polyester thread designed primarily for use as a bobbin thread in longarm and domestic quilting machines. Bottom Line is significantly finer than standard 40wt thread and even finer than So Fine! 50wt, providing the lightest possible thread presence in the bobbin for professional, competition-grade quilting results.

Frequently Asked Questions

What is Bottom Line designed for?

Bottom Line is designed primarily as a bobbin thread to pair with heavier top threads. The extremely fine 60wt weight in the bobbin minimizes the bobbin thread’s visibility at stitch penetration points on the quilt back, producing a more polished, professional back appearance. Popular for competition and show quilting.

Can Bottom Line be used as a top thread?

Bottom Line can be used as a top thread on domestic machines for very delicate applications, but it is primarily a bobbin thread. Its extreme fineness requires careful tension management as a top thread.

Is Bottom Line appropriate for longarm bobbins?

Yes — Bottom Line is specifically designed for longarm bobbins where a finer bobbin thread improves the back appearance of the finished quilt.

Does Bottom Line come in colors?

Bottom Line is available in a range of colors for tonal bobbin matching. White is the most commonly stocked color. Check Linda’s current listing for available Bottom Line colors.

Is Bottom Line appropriate for everyday production?

It is used in competition and premium production settings. For standard production, standard 40wt bobbins are more economical.