（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 will involve wrapping only one layer of covering yarn around a core yarn, ordinarily spandex. This method brings about a yarn that offers reasonable elasticity and power, which makes it well suited for various applications. Make sure you speak to your healthcare ser... https://michaelo011pyk4.bloggactif.com/profile