elastane

This term refers to a specific synthetic polymer known for its exceptional elasticity. In commercial contexts, it is frequently used interchangeably with the brand name Lycra, though elastane is the generic chemical term for the fiber.

As a material noun referring to a chemical substance or fabric component, it is treated as an uncountable mass. It is typically used in the context of textile composition labels, such as "cotton-elastane blend," rather than as a countable object.