Leggings Manufacturing Guide (Seamless vs Sewn, GSM & QC)
Leggings are the highest-volume activewear SKU in the world — and the easiest to get wrong. Fabric weight, construction and QC decide whether your line sells or returns.
Seamless vs sewn leggings
- Seamless: circular knit, no side seams, better for compression & sculpting; faster production per unit
- Sewn: gusset + flat-lock seams, more design flexibility (pockets, panels)
- Hybrid: seamless body + sewn waistband is common for value lines
GSM guide by use
Training/yoga 220–280 GSM; light compression 200–240; thermal winter 280–320. Below 200 GSM risks see-through; above 320 feels too hot for most uses.Squat-proof QC
- Test opacity in motion (bent-over and lunge), not standing
- Use double-layer or higher nylon % for light colors
- Document stretch-recovery: must return ≥95% after 100 stretch cycles
Sizing & grading
High-waist XS–XL is table stakes; S–5XL inclusive grading is the competitive edge. Provide a fit model spec per size band — we grade from your approved fit sample.MOQ & sampling
Sample first (7 days), then in-stock from 1 piece to test, private label from 100, OEM from 300. See our custom leggings page for the full process.Alpinario is a leggings manufacturer in Zhejiang, China — seamless and sewn, squat-proof tested, MOQ-friendly for startups and brands.
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