Spandex, also known as elastane or Lycra, is a synthetic fiber known for its exceptional elasticity. It is often blended with other materials to improve comfort fit in clothing, making it a popular choice for activewear, swimwear, and form-fitting garments. Spandex can stretch up to five its original length and quickly return to its shape, providing ease of movement and a snug fit. Its lightweight and breathable properties also contribute to its widespread use in fashion and sports apparel.