spandex

Spandex is a type of fabric that's super stretchy and flexible.

You might know spandex by its brand name Lycra, but it's commonly used to make clothes like leggings, yoga pants, and swimwear. The word "spandex" usually refers to the material itself, not just clothing made from it, although you'll often find these words used together. Think of your favorite pair of flexible workout pants - chances are they're made with spandex.