Fiber Guide · B2B Sourcing · Data-Driven
Spandex (Elastane) Yarn for
Athleisure.
Spandex — sold as Lycra (Invista), ROICA (Asahi Kasei), or Creora (Hyosung) — is the functional backbone of every high-performance athleisure garment.
A comprehensive breakdown for sourcing teams.
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Technical Details
Manufacturing specifications.
Decision-grade specs for Spandex (Elastane) in Athleisure. Open each block for the numbers, process constraints, and sourcing details that matter before production.
4 sections
23 checkpoints
Quick Read
First-pass technical cues
GSM Range
Leggings / Yoga Pants: 160–220 GSM (lighter for summer/studio, heavier for year-round/cold-weather)
Yarn Count
Nylon covering yarn: 40D/34F to 70D/68F (finer filament counts = softer hand)
Knit Construction
4-way stretch interlock: Best for leggings and yoga pants — stitch structure provides equal stretch in warp and weft, recovers cleanly, produces flat back face suitable for printing
Shrinkage
4-way stretch interlock (nylon-spandex): Length 2–4%, Width 1–3% after first wash at 30°C
GSM Range
• Leggings / Yoga Pants: 160–220 GSM (lighter for summer/studio, heavier for year-round/cold-weather) • Sports Bras / Crop Tops: 140–180 GSM • Joggers / Track Pants: 220–280 GSM (often brushed or French terry constructions) • Typical sweet spot for multi-season athleisure leggings: 180–200 GSM in 4-way stretch interlock
Yarn Count
• Nylon covering yarn: 40D/34F to 70D/68F (finer filament counts = softer hand) • Polyester covering yarn: 50D/72F to 75D/72F (DTY textured for moisture management) • Spandex core: 20D (yoga/pilates), 40D (mainstream athleisure), 70D (compression/training) • Double-covered yarn preferred over single-covered for leggings — reduces bare spandex exposure at cut edges
Knit Construction
• 4-way stretch interlock: Best for leggings and yoga pants — stitch structure provides equal stretch in warp and weft, recovers cleanly, produces flat back face suitable for printing • Single jersey (1-way stretch): Suitable only for tops and casual pieces, insufficient for bottoms • Circular knit rib (2x2 or 4x4): Ideal for waistbands and cuff applications within the garment • Jacquard / mesh panels: 20–30% of athleisure incorporates ventilation panels; spandex content can be reduced to 10–12% in mesh areas
Shrinkage
• 4-way stretch interlock (nylon-spandex): Length 2–4%, Width 1–3% after first wash at 30°C • Polyester-spandex: Similar, slightly less prone to length shrinkage • Heat-set finishing reduces shrinkage to under 2% in both dimensions — specify heat-setting in your tech pack
Pilling Resistance
• Nylon-spandex: Grade 4–5 (ISO 12945-2 Martindale, 5000 cycles) — nylon's high tenacity resists fibre breakage • Polyester-spandex: Grade 3–4 — microfiber polyester susceptible to pilling at abrasion points (inner thigh) • Specify anti-pilling finish or higher twist DTY polyester to improve grade
Colorfastness
• Wash fastness (ISO 105-C06): Grade 4–4.5 • Light fastness (ISO 105-B02): Grade 4–5 (UV stabilizers improve this to 5–6 for outdoor-use athleisure) • Rubbing fastness (ISO 105-X12): Dry Grade 4, Wet Grade 3–3.5 (common limitation — specify wet rubbing in QC) • Perspiration fastness (ISO 105-E04): Grade 4 — important for athleisure given intended use conditions
Tensile Strength
• Nylon-spandex fabric: 350–500 N (warp), 300–450 N (weft) — ASTM D5034 grab test • Polyester-spandex: 280–420 N — adequate for athleisure, not suitable for high-abrasion sportswear
MOQ Guidance
• Fabric (from mill): 500–1,000 metres per colourway per construction • Yarn (spandex, Invista/Hyosung brand): 100–200 kg minimum per denier/colour • Finished garments (CMT): 200–300 pieces per style per colourway at most Indian/Bangladesh factories • For nylon-spandex from Korean mills (top-tier quality): MOQs typically 1,500–3,000 metres
Honest Assessment
Every fibre has limits. Here's the full picture.
Every fibre has limits. Here's the full picture.
Strengths
Limitations
Unmatched stretch-recovery performance
: No commercially available fiber at scale delivers 500–800% elongation with near-complete recovery. For leggings and yoga pants, spandex is non-negotiable — every alternative compromises on either stretch extent or recovery force.
Non-biodegradable and difficult to recycle
: Spandex is polyurethane-based synthetic fiber. In blended fabrics, separating spandex from nylon or polyester for recycling is commercially unfeasible with current technology. Every spandex-blend garment that enters landfill will persist for hundreds of years. Recycled-content options (ROICA V550 claims 50% post-industrial recycled content, Lycra EcoMade uses 100% pre-consumer recycled polyurethane) exist but carry 25–40% price premiums and require supply chain verification. Brands with sustainability commitments must weigh this honestly.
Dimensional stability across wear cycles
: A correctly engineered nylon-spandex or polyester-spandex fabric at 15–20% spandex content maintains shape through 80–100 wash cycles, directly reducing customer returns and brand damage from "stretched-out" garments.
Heat and chemical sensitivity
: Spandex degrades irreversibly at temperatures above 150–160°C (depending on grade), and chlorine bleach destroys elastic performance within a few wash cycles. Care label communication must be explicit. Manufacturing processes — dye, heat-set, tumble dry — must all be controlled within these parameters, adding process complexity versus all-synthetic alternatives.
Compatible with performance finishes
: Moisture management, anti-odour (silver ion, copper-based), and UV protection finishes all apply cleanly to spandex blend fabrics — the polyurethane surface doesn't resist finish uptake the way hydrophobic synthetics can.
Cost floor it sets on product pricing
: Spandex content at 15–20% adds meaningfully to fabric cost. At ₹800–1,200/kg for Invista or Hyosung branded spandex yarn, a 180 GSM fabric with 18% spandex content carries ₹25–40/metre in spandex yarn cost alone. This is manageable for mid-market and premium athleisure but makes sub-$15 retail price points structurally difficult in quality-compliant production.
Enabling complex garment construction
: Spandex's stretch tolerance simplifies pattern cutting (less precision required in sizing) and enables seamless construction — one continuous tube of fabric for leggings with no side seams, reducing production cost per unit.
Opacity engineering control
: The interplay of spandex draw ratio, covering yarn denier, and stitch density gives designers and mills specific technical levers to engineer opacity — a brand can specify exactly the opacity performance they need and achieve it reliably.
Strength
Unmatched stretch-recovery performance
: No commercially available fiber at scale delivers 500–800% elongation with near-complete recovery. For leggings and yoga pants, spandex is non-negotiable — every alternative compromises on either stretch extent or recovery force.
Limitation
Non-biodegradable and difficult to recycle
: Spandex is polyurethane-based synthetic fiber. In blended fabrics, separating spandex from nylon or polyester for recycling is commercially unfeasible with current technology. Every spandex-blend garment that enters landfill will persist for hundreds of years. Recycled-content options (ROICA V550 claims 50% post-industrial recycled content, Lycra EcoMade uses 100% pre-consumer recycled polyurethane) exist but carry 25–40% price premiums and require supply chain verification. Brands with sustainability commitments must weigh this honestly.
Strength
Dimensional stability across wear cycles
: A correctly engineered nylon-spandex or polyester-spandex fabric at 15–20% spandex content maintains shape through 80–100 wash cycles, directly reducing customer returns and brand damage from "stretched-out" garments.
Limitation
Heat and chemical sensitivity
: Spandex degrades irreversibly at temperatures above 150–160°C (depending on grade), and chlorine bleach destroys elastic performance within a few wash cycles. Care label communication must be explicit. Manufacturing processes — dye, heat-set, tumble dry — must all be controlled within these parameters, adding process complexity versus all-synthetic alternatives.
Strength
Compatible with performance finishes
: Moisture management, anti-odour (silver ion, copper-based), and UV protection finishes all apply cleanly to spandex blend fabrics — the polyurethane surface doesn't resist finish uptake the way hydrophobic synthetics can.
Limitation
Cost floor it sets on product pricing
: Spandex content at 15–20% adds meaningfully to fabric cost. At ₹800–1,200/kg for Invista or Hyosung branded spandex yarn, a 180 GSM fabric with 18% spandex content carries ₹25–40/metre in spandex yarn cost alone. This is manageable for mid-market and premium athleisure but makes sub-$15 retail price points structurally difficult in quality-compliant production.
Strength
Enabling complex garment construction
: Spandex's stretch tolerance simplifies pattern cutting (less precision required in sizing) and enables seamless construction — one continuous tube of fabric for leggings with no side seams, reducing production cost per unit.
Strength
Opacity engineering control
: The interplay of spandex draw ratio, covering yarn denier, and stitch density gives designers and mills specific technical levers to engineer opacity — a brand can specify exactly the opacity performance they need and achieve it reliably.
Common Questions
Spandex (Elastane) for Athleisure — answered.
Spandex for Athleisure — answered.
"Spandex" and "elastane" and "Lycra" are the same chemical — polyurethane fiber, called spandex in the US, elastane in Europe, with Lycra being Invista's brand name. The meaningful distinction is brand quality: Invista Lycra and Hyosung Creora are manufactured to tighter tolerances than generic Chinese spandex, producing more consistent draw ratio, better heat stability, and documented stretch recovery performance. For athleisure above the $30 retail price point, specifying Invista or Hyosung by name in your tech pack is worth the 20–30% cost premium — it's a quality assurance mechanism, not just marketing.
More Resources
Explore adjacent fibres, applications, and technical terms.
Alternative fibres for Athleisure:
Related glossary terms:
Experience It
The difference isn't marketing.
It's in the fibre.
One wash cycle won't tell you. Thirty will.
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