Spandex has now become a standard fiber in lingerie, hosiery, leisurewear, and sportswear. New applications, from men's suits to children's wear, diapers to footwear, continue to be developed. Manufacturers have refined their technology, making possible the explosion of new applications. In this study, some commercially available spandex filaments were evaluated for their mechanical and thermal properties. The differences in performance of soft, medium and high modulus spandex fibers are elaborated.