behavior of CSFs; the breaking loading force of the yarn was almost equal to the sumof the breaking loading force that the single fiber within the CSF yarn could with-stand (Figures S6C and S6D;Table S3). It is noteworthy that the fracture behaviorof regular yarns consisting of short fibers can be significantly influenced by the de-gree of the twisted structure. This is because the slip between the short fibers wouldbe restricted as the degree of twisting increases. However, the effect of the twistingprocess on CSF yarns consisting of long CSFs was different, according to both thesimulation and experimental results (Figures S7andS8;Tables S3andS4).