Spandex covered nylon yarns are used on the highest quality sweater, socks,fabrics, etc. ... . We are professional on producing spandex covered yarns. Adopt advanced technolyge and equipment, Whole Air covered yarns. It is different traditional technics" Ring ... used on Socks, Seamless, Warp Knitting, Weft Knitting, and Tatting. Air Covered Yarns