Isacord 1000m 聚酯纖維 4103 加州藍 縫紉線

Finally got to test this on a heavy satin stitch fill, and the tension was flawless the entire run without a single snap. Nearly twice the strength of rayon really shows—the color is vibrant and the finish is noticeably smoother than other threads I’ve used. Sewing with it feels like butter.

I used this for a dense logo design and the polyester thread didn't break once, even at high speed. The color is a vibrant California blue that really pops against white fabric.

Started a new embroidery project and this thread ran through my machine like butter, zero fraying or breaking even on tricky satin stitches. The polyester strength is noticeable—I've had rayon snap on me mid-design, but this held up perfectly for the whole 1000m spool.