Spandex, ndi mtundu wa mankhwala opangira nsalu zachikhalidwe, omwe amagwiritsidwa ntchito kwambiri povala. Chofunikira cha spinneret chidzakhala chapamwamba kuposa chomwe chimagwiritsidwa ntchito popanga nsalu yopanda nsalu. msika, ndipo anagulitsidwa kum'mwera chakum'mawa kwa Asia.