Lycra Fiber, Also Known As Spandex Or Elastane, Is A Synthetic Fiber That Is Known For Its Exceptional Elasticity And Strength. It Is Made From A Long-chain Polymer Called Polyurethane, Which Is Able To Stretch Up To Five Times Its Length Without Breaking. Lycra Fibers Are Often Blended With Other Fibers, Such As Cotton Or Polyester, To Create Fabrics With Increased Stretch And Recovery. This Makes Them A Popular Choice For Activewear, Swimwear, And Other Form-fitting Clothing. Lycra Fibers Are Also Resistant To Damage From Oils, Sweat, And Sunscreen, And Are Able To Retain Their Shape Even After Repeated Washings.