Natural fiber spinning weaving stage, will have the same direction of the S turn, this is a unique kind of circular knitted fabric knitting physical properties (such as car wound down the mountain on the line), and later made fabric, after washing will physical shun hosiery to produce torque； torque is one of the skew distortion caused knitted products after launching the culprit, that is, the use of positive and negative twist fabric surface S, Z direction weave, reaction to the physical characteristics of the resulting offset, reduce torque.

Cloth visible around the turn of the texture detail is the biggest feature, it is often used in high－end single cloth goods.

天然纖維在紡紗織製階段，會產生一致方向的S轉，此為針織布類特有的圓編物理性（如汽車順著山勢繞上而行），而製成織物後，經過水洗會使針織製品的物理順向產生扭力；扭力則是造成針織產品下水後扭斜變形的元凶之一，正反撚即是利用織物表面的S、Z方向織法，所產生的反作用物理特性去抵消、降低扭力。

布面可見細致的左右交替紋理即為最大特徵，常被用於高端的單面布商品。