Yarn Grading: I usually check with grading specifications, which contain the diameter and uniformity of yarn strands. A regular diameter delivers improved look and efficiency of fabrics. Elasticity，toughness，breathability，flexibility，shape retention，very good dyeability，light-weight In the single-covered approach, polyester or nylon filaments are utilized to wrap a spandex core.... https://waylonswyyx.thelateblog.com/32228520/everything-about-covered-spandex-yarn