Fiber Guide · B2B Sourcing · Data-Driven
Polyester Yarn for
Activewear.
Polyester dominates activewear for a reason that goes beyond cost: its hydrophobic fibre structure physically cannot hold moisture at the core, forcing sweat to the fabric surface where it evaporates.
A comprehensive breakdown for sourcing teams.
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Technical Details
Manufacturing specifications.
Decision-grade specs for Polyester in Activewear. Open each block for the numbers, process constraints, and sourcing details that matter before production.
4 sections
24 checkpoints
Quick Read
First-pass technical cues
GSM Range
Training wear / light layers: 120–150 GSM
Yarn Count
Filament polyester: 75D/72F to 150D/288F typical range for activewear
Knit Construction
Single jersey: Lightweight tops, base layers — lowest cost, highest breathability
Shrinkage
Filament polyester: 1–3% length, 0–1% width after first wash at 40°C
GSM Range
• Training wear / light layers: 120–150 GSM • Standard activewear tops and shorts: 150–180 GSM • Compression garments / tights: 180–220 GSM • Performance fleece / mid-layers: 220–280 GSM Lower GSMs require higher filament count per yarn to maintain fabric integrity and wicking performance. Avoid going below 120 GSM on single jersey constructions — fabric will be translucent and prone to snagging.
Yarn Count
• Filament polyester: 75D/72F to 150D/288F typical range for activewear • Spun polyester (where used): 30s–40s Ne for woven components • Spandex component: 20D–40D bare or covered spandex for stretch constructions
Knit Construction
• Single jersey: Lightweight tops, base layers — lowest cost, highest breathability • Interlock: More stable, heavier hand feel, better for printed garments (less distortion) • 4-way stretch interlock: Premium compression and leggings, requires spandex integration • Mesh / eyelet: Ventilation panels, training shorts, typically 100–130 GSM • Piqué: Polos and structured activewear tops — good shape retention
Shrinkage
• Filament polyester: 1–3% length, 0–1% width after first wash at 40°C • Spun polyester: 2–4% length, 1–2% width • Polyester-spandex blends: 3–5% length depending on spandex tension at setting Pre-boarding (heat setting the finished garment at 180–190°C for 30–45 seconds) reduces shrinkage to near-zero. Essential for compression garments.
Pilling Resistance
• Filament polyester (woven or knit): 4–5 on Martindale scale • Spun polyester: 2–3 (noticeably worse — filament is strongly preferred for activewear) • Polyester-spandex interlock: 4 (spandex can introduce small pilling at high-abrasion zones)
Colorfastness
• Wash fastness (ISO 105-C06): 4–5 • Light fastness (ISO 105-B02): 5–6 (disperse dyes on polyester outperform reactive dyes on cotton) • Rubbing fastness (dry): 4–5; (wet): 3–4
Tensile Strength
• Polyester filament: 35–60 cN/tex (breaks at higher loads than cotton's 25–35 cN/tex) • Seam strength (flatlock, 300 stitches/min): 150–200 N (ASTM D1683)
MOQ Guidance
• Standard constructions (single jersey, interlock): 500–1,000 kg minimum per colour per fabric • Sublimation-ready base fabrics (100% polyester, low-extension): 300–500 kg • Engineered 4-way stretch constructions: 1,000–2,000 kg (specialist mills require higher MOQs) • Yarn MOQ (if supplying to contract mill): 500–1,000 kg per count/denier
Common Questions
Polyester for Activewear — answered.
Polyester for activewear — answered.
Polyester is 30–50% less expensive per kg than nylon at comparable filament counts and delivers comparable moisture management in most training wear applications. Nylon has higher abrasion resistance (Martindale > 30,000 vs polyester's 20,000) and better fatigue resistance under repeated flex — advantages that justify its cost premium in compression shorts, swimwear, and high-friction applications. For training tops, shorts, and yoga wear where abrasion isn't the primary stress factor, polyester delivers 85–90% of nylon's performance at 60–70% of the cost. Default to polyester; specify nylon only where abrasion data or specific performance requirements justify the premium.
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The difference isn't marketing.
It's in the fibre.
One wash cycle won't tell you. Thirty will.
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