Elastane (spandex, Lycra®)
A highly elastic polyurethane-based fibre added in small percentages to give stretch and recovery. LYCRA® is a brand. 'Spandex' is the US term.
How it’s made
- 1Segmented polyurethane is dry-spun into elastic filaments.
- 2Usually core-spun or covered with another yarn and blended at a few to ~30 percent.
What to look for
- Enough elastane for recovery in tights
- Chlorine-resistant variants for swimwear
Pros
- Stretch and shape retention
- Freedom of movement
Cons
- Degrades with heat, chlorine and age
- Makes recycling blends harder
Typical use
- Running:
- Tights, shorts liners, bras.
- Streetwear:
- Stretch denim, jersey.
Sustainability
Small percentages, but they make garments very hard to recycle.