（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。） Single covered yarn includes wrapping one layer of masking yarn around a core yarn, generally spandex. This method results in a yarn that provides reasonable elasticity and toughness, making it ideal for a range of purposes. This type of yarn is solely a innovation which have been legi... https://nathanielo528zad7.wikiexpression.com/user