double covered yarn for Dummies
Our spandex is 1st covered with fiber inside of a z-twist, and after that covered once again by having an s-twist. This makes certain that no spandex comes into direct contact with the skin.(この画像の場合は、芯ゴムは、天然ゴム糸で、カバード糸は、上糸も下糸もポリエステル糸の生成色です。): Furnishi