Polyester and spandex are two popular synthetic fibers commonly used in clothing and activewear. Polyester is known for its durability, wrinkle resistance, and moisture-wicking properties, making it ideal for athletic wear. Spandex, on the other hand, is highly elastic and provides stretch and flexibility to garments. When blended together, polyester and spandex create a fabric that is comfortable, breathable, and form-fitting. This blend is often used in leggings, workout tops, and other athletic apparel to provide a snug yet flexible fit that moves with the body during physical activity.