Why is spandex used in stretch fabrics such as sportswear and swimsuits?

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major industrial polymers Figure 1: The linear form of polyethylene, known as high-density polyethylene (HDPE).

Spandex is widely used in sportswear and swimsuits primarily due to its exceptional elasticity. As a synthetic fibre composed of at least 85 percent polyurethane, it can be stretched 500 to 610 percent beyond its original length and return to its original shape without breaking.1

This material is preferred for active apparel because it is lightweight, cool, and resistant to deterioration from body acids. Furthermore, it is practical for frequent use as it is easily laundered, quick-drying, and absorbs very little moisture. By providing these highly elastic properties, spandex has largely replaced traditional rubber fibres in many textile applications.1