... and polyester covered spandex yarnthe spandex we use includes 20d,30d,40d,70d,140d etc.the nylon we use includes 20d,30d,40d,50d,70d,100d,140d ... covered yarns you want.Covered spandex yarn is broadly used for socks, sweater, seamless, denim, woven fabric, knitting fabric, large circular knitting machines ...