Compared with stress-elongation characteristics between spandex and XLA, we recommend higher draft rate for XLA.
　　The draft rate of XLA is corresponding to different thickness of covering yarn and the denier of XLA and could be adjusted with limited range to achieve desired elasticity of customer. To improve flexibility, use coarser XLA, use higher draft rate, set higher pre-treatment temperature, and reduce weft tension during dyeing & finishing process as much as possible.

　　For cotton-like fibers, recommended draft rate showed as following: