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Lycra is a tradename of Invista for their brand of spandex, a synthetic fiber with exceptional elasticity. Spandex was invented by a DuPont chemist in the late 1950s and is stronger and more durable than rubber. Lycra is considered an elastomeric fiber, one that can be stretched and expanded to twice its original length.

Lycra may be stretched repeatedly and still recover its original length. It is lightweight, abrasion-resistant, easily dyed, comfortable, soft and smooth. It is commonly used as a small percentage of the total textile material in swimsuits, wetsuits, activewear, bras, leggings, socks, and underwear.

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