Spandex is a synthetic fiber known for its exceptional elasticity and stretchability. It is stronger and more durable than rubber.

Spandex revolutionized many areas of the clothing industry. It is one of the most used and best materials in lingerie.

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.

Satin isn't a specific material, but a word used for shiny, soft (silk-like) cloths, like rayon, a different type of man-made fiber.
Rayon is made from a natural polymer that is specially treated before making the fabric.

Before talking about Spandex and polyesters, we should talk about polymers.
Polymers are a class of chemicals that are often known as plastics

Spandex is a type of polyurethane, a class of polymers which is also used for foam cushions.

Polyesters are another class of polymer. Uses of this polymer vary from clothing to plastic pop bottles.

Satin isn't a specific material, but a word used for shiny, soft (silk-like) cloths, like rayon, a different type of man-made fiber.