"Spandex" is a generic name and not derived from the chemical name of the fiber, which most manufactured fibers are, but derived by shifting around the syllables in the word expand.[1] "Spandex" is the preferred name in North America; elsewhere it is referred to as "elastane".

The most famous brand name associated with spandex is Lycra, a trademark of Invista (formerly part of DuPont). Such is Lycra's prominence it has become a genericised trademark in many parts of the world, used to describe any kind of spandex. Invista discourages such use, protecting its trademark vigorously.

                                  source: Wikipedia

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