Bottom Line 60wt in Natural White: The Bobbin and Appliqué Thread That Disappears
Some threads are meant to be seen. Others earn their keep by vanishing. The Bottom Line thread from Superior Threads belongs firmly in the second camp, and the 624 Natural White colorway on a generous 3,000-yard cone is one of the most useful versions of it you can keep beside your machine. It is a fine, lint-free polyester thread designed specifically for appliqué, bobbin work, and quilting — the jobs where a bulky or fuzzy thread would only get in the way.
What Bottom Line Is
Bottom Line is a 60-weight, 2-ply polyester thread. That 60wt designation matters: it is noticeably finer than the 40wt threads many quilters use on top, and finer than a standard 50wt piecing thread as well. Because it is polyester, it offers strong, consistent performance without the lint that natural-fiber threads can leave behind in your bobbin case and tension discs. The product description puts it plainly — "lint-free never felt so good" — and anyone who has cleaned a clogged bobbin area mid-project will appreciate why that matters.
Natural White (color 624) is a soft, warm-leaning white rather than a stark optical bright. That makes it an exceptionally good blender: its lightweight, neutral tone is easily matched with a wide range of top threads and light-colored fabrics, so the bobbin thread does not shadow through or fight with what is happening on the surface of the quilt.
What It Is Best For
Bobbin thread. This is Bottom Line's headline role. A fine 60wt thread in the bobbin lets you wind more yardage onto each bobbin, balances beautifully with a variety of top threads, and produces flatter seams and quilting stitches because there is simply less bulk underneath.
Invisible appliqué and binding. The fine weight lets stitches sink into the fabric layers, so appliqué edges and binding stitches stay discreet. Whether you are machine-appliquéing shapes or finishing a binding, Bottom Line stitches through layers of fabric without building a ridge.
Micro-stippling and dense quilting. When quilting designs get tiny and dense, a heavier thread can overwhelm the texture and thread-build quickly. Bottom Line is described as fantastic for micro-stippling, where its fineness lets the texture of the quilting — not the thread itself — take the lead.
English Paper Piecing. Hand sewers love a fine thread that pulls pieces together tightly without showing, and Bottom Line's lightweight construction suits EPP's small, precise stitches.
How It Compares to Alternatives
Against a standard 40wt quilting thread used in the bobbin, Bottom Line is much finer — you trade a little visibility for far less bulk and longer runs between bobbin changes. Against cotton bobbin threads, the polyester Bottom Line runs virtually lint-free, which means cleaner tension and less maintenance. And compared with using the same thread top and bottom, pairing a decorative or heavier top thread with Bottom Line below is often the easiest way to fix puckering and looping: the fine bobbin thread simply plays well with others.
Tension and Needle Tips
Because Bottom Line is fine and smooth, many machines need a slight bobbin tension adjustment when switching to it — if your top stitches look loose, check the bobbin side first. On top, it pairs well with a size 70/10 or 80/12 needle for appliqué and fine quilting work. Always run a small test sandwich with your actual top thread and batting before starting: Bottom Line's blending quality means tension problems hide until you flip the quilt over.
Care and Storage
Polyester thread is colorfast and durable, and finished quilts stitched with Bottom Line can be washed as the fabric requires. Store the cone upright, away from direct sunlight and dust — a cone cover or thread net keeps the fine strands from unwinding and tangling between projects. At 3,000 yards per cone, one Natural White cone will quietly support many quilts' worth of bobbins, bindings, and appliqué.
Shop the 624 Natural White Bottom Line Polyester Thread at Linda's Electric Quilters.
