In this type, the Spandex Yarn is first covered with Polyester or Nylon DTY in a spiral wave with S twist & then on top of it, the yarn is again covered with Polyester or Nylon DTY in a spiral wave with Z twist. One is outer covering, and the other is inner covering. So the Spandex is double covered with yarn and final yarn has zero torque. The different TPM and DR make various senses of comfort touch and extension.
|Polyester 75D to 300D||20D to 1400D||500 TPM to 2000 TPM|
|Nylon 20D to 100D||20D to 1400D||500 TPM to 2000 TPM|