Seamless Fabric Spec Builder
Answer two questions, get a factory-grade fabric spec: composition, GSM range, knit structure, yarn and stretch/recovery — plus a tech-pack clause you can paste straight into your file. Free, no signup.
How it works: the builder encodes the specification logic we use in production — e.g. squat-proof leggings at 220–260 GSM in 75/25 nylon-spandex, rib run 10–20 GSM heavier, light nude shades at the top of the density spec. Pick a product, tick your priorities, copy the clause.
Build your spec
2 · Priorities (tick any)
Why these numbers
Every value is published and defended in our guides: spandex ranges in How Much Spandex Should Leggings Have?, weight-vs-opacity logic in the squat-proof guide, yarn choices in the yarn guide, rib adjustments in the rib guide, and winter builds in winter seamless. Baselines reflect our live catalog: 3,038 styles, 88% nylon/spandex, median 24% spandex — see the wholesale price benchmark.
A spec is a starting point, not a contract: real development still means fabric cards, a fit sample in 7–10 days and a squat test before bulk. When seamless is the wrong construction for your idea — precise colour-blocking, woven outerwear — we will tell you, and cut-and-sew is the better path.
FAQ
Is this spec builder free to use?
Yes — free, no signup, no email gate. It encodes the same numbers we publish across our fabric guides and use in production at Yesseam.
Are these specs binding quotes?
No. They are engineering starting points — realistic composition, weight and structure ranges for each product type. Your final spec is confirmed against real fabric cards during development.
Can I paste the output into my tech pack?
That is what it is for. The generated clause covers composition, GSM, structure, yarn and stretch/recovery — the five lines most tech packs miss. Adjust values after sampling.
Where do the numbers come from?
From Yesseam's production standards and our published catalog data — 3,038 styles: 88% nylon/spandex blends, median 24% spandex, squat-proof leggings at 220–260 GSM.
Want the spec turned into a sample?
Send the generated clause to Yesseam — a vertically integrated seamless factory in Xiamen. Stock programs from 50 pcs plain or 100 pcs with your logo; custom development from 500 pcs; first sample in 7–10 days.
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