Spandex output needs major technical experience and specialised products, which suggests that the creation of spandex is usually concentrated in a number of big providers that have the resources to invest in research and improvement. Elasticity,longevity,breathability,flexibility,form retention,very good dyeability,lightweight Herng Fa prides alone on experience in covered yarn ... https://smokingthread94825.blogdal.com/32109639/covered-spandex-yarn-secrets