Lycra is just another name or brand name for spandex. It is used to designate fabrics for swimwear, sportswear or dancewear. These are usually made of polyamide with an elastane content of 18 to 25 percent. This makes them very elastic and snuggles up to the shape of the body.
Details
Good to know
Washing recommendation
The fabric is washable at 30°C
Data sheet
Specific References