Superior Bottom Line 60wt Polyester Thread — Cone Format
Bottom Line is the longarm quilter's gold standard bobbin thread — 60-weight 2-ply polyester, fine enough to virtually disappear into the quilt back and strong enough to withstand the tension demands of high-speed production longarm work. Available in 66 solid colours on large cones, Bottom Line covers every working colour a longarm studio needs for bobbin matching and invisible top thread applications. The palette is mapped in colour-group guides — start with the whites and creams, then the neutrals and darks — and for even finer invisible work step down to MicroQuilter 100wt.
Why 60wt for Longarm Bobbins?
The 60wt construction sits at the sweet spot for longarm bobbin use — fine enough that it doesn't create bobbin buildup or affect tension, strong enough that it resists breaking under production tension. The polyester construction is colourfast, consistent, and performs identically from beginning of cone to end. Bottom Line also works beautifully as a top thread when an invisible or near-invisible finish is the goal.
Available Colours
66 solid colours from natural white and lace white through the complete working spectrum — whites, creams, neutrals, greys, black, pastels, vivids, and deep tones. Every colour a production longarm studio needs, all in the same fine 60wt polyester construction.
Shop All Bottom Line Cone Colours
Frequently Asked Questions
Why do longarm quilters standardise on Bottom Line for bobbins?
Three compounding reasons: the fine 60wt packs far more yardage per bobbin (fewer mid-quilt changes), the low profile eliminates the thread buildup that throws tension on dense designs, and the polyester runs consistently at production speed. One product solves the three chronic bobbin problems at once.
How do I match bobbin colour across a whole customer quilt?
Match the backing, not the top — the bobbin lives on the back. With 66 colours the standard practice is to hold the cone against the backing fabric and pick the closest value; when in doubt, one value lighter hides better than one darker.
Can Bottom Line run as a top thread?
Yes — at 60wt it's a favourite for stitch-in-the-ditch, micro-fills, and any quilting meant to be felt rather than seen, with more body than 100wt MicroQuilter but far less presence than 40–50wt quilting threads. Use a 70/10–80/12 needle when it goes up top.
