The elastic core-spun yarn market is projected to grow from USD 2,257.5 million in 2026 to USD 4,652.8 million by 2036, at a CAGR of 7.5%. Spandex/Elastane Core will dominate with a 58.0% market share, while cotton & cellulosic blends will lead the sheath fiber segment with a 42.0% share.