What is Spandex? 

Spandex is a generic fiber category. It is defined as “a manufactured fiber in which the fiber-forming substance is a long chain synthetic polymer composed of at least 80% of a segmented polyurethane.”
Spandex is an anagram of the word “expands”

Is spandex a fiber or fabric?

Spandex, Lycra, or elastane is a synthetic fiber known for its exceptional elasticity. It is a polyether-polyurea copolymer that was invented in 1958 by chemist Joseph Shivers at DuPont's Benger Laboratory in Waynesboro, Virginia, US.

Why spandex is good for yoga clothes ? 

It's extremely flexible and stretchy, making it great for people who do workouts that require a large range of motion, such as yoga and stretching for meditations. This synthetic fabric is found primarily in skin-tight clothing, such as track shorts, leggings and yoga bras.

Spandex is "moisture-wicking," which means that it won't show sweat (even though it might help cause it) that is why it is good for yoga clothes

Is spandex made of cotton?

Cotton the natural fiber known and Lycra is an exceptionally stretchy, synthetic fiber with increased elasticity and is famous under the name 'Spandex'.
These fabrics are generally manufactured by wrapping cotton fibers onto the filaments of spandex, which is a bunch of several tiny synthetic filaments.

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