Beyarns elastic covered yarn is spandex yarn wrapping with one or two strands of filament yarns to increase filament yarns with higher elasticity. \n\na:single covered yarn-scy\nspandex is wrapped with one filament yarn such as nylon. it can be divided into two specifications- s and z twist. .\n\nb:double covered yarn-dcy \nspandex is wrapped with two filament yarns in opposite directions. one is outer covering, and the other is inner covering.\n