Spandex is a polyurethane-based polymer. It is produced by reacting a polyester with a diisocyanate, forming long-chain polymers with elastic segments. These fibers can stretch up to five to eight times their original length and return to their original shape without damage. This exceptional stretchability makes spandex ideal for garments that require a snug fit and high flexibility. https://www.coherentmarketinsights.com/market-insight/spandex-market-311