What is the Difference Between Lycra and Spandex?

Question: What is the difference between spandex and Lycra fibers? Is there any technical difference? And what are the fabric properties differs for cotton/spandex fabric and cotton/lycra fabric?

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Difference Between Lycra and Spandex

Unraveling the Eco-Friendly Truth: Spandex vs Elastane vs Lycra

Custom Spandex Shorts - Goal Sports Wear

Elastane vs Spandex: Suitable For A Sustainable Stretch?

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What is Lycra Fabric: Properties, How its Made and Where

Sewing Lycra / Spandex / Elastane