Cross‐Scale Regulation of Coaxial Twisted Core‐Sheath Composite Yarn for Constructing Permeable Intelligent Fabric with Multiple Protection and Perception

Abstract Smart fabrics with health protection, motion monitoring, and perception capabilities effectively managed and optimized human health, significantly promoting the development of smart health. However, it remains challenging to achieve the multifunctional and mechanical robustness required for use in multiple scenarios without destroying the characteristics of the softness and air permeability. Here, a cross‐scale regulation strategy is presented based on the chemical coupling‐physical twisting to develop a multiscale twisted core‐shell structure yarn. Benefiting from the strong interfacial interactions and the coaxial twisted wrapping structure, the multi‐component functional particles are highly stably integrated into the yarn while achieving ultra‐high strength (≈0.662 GPa). The resulting fabric exhibits good impact resistance (attenuate > 40% of impact force), superior air permeability (387.37 mm s −1 ), excellent eletromagnetic interference (EMI) shielding (36.1 dB), IR thermal camouflage, high triboelectric output ( V oc ≈39.1 V), and the ability to sensitively perceive environment safety and monitor human health in real‐time. This study effectively addresses the long‐lasting challenge of balancing functionality and comfort and offers a new perspective for developing next‐generation advanced wearable multifunctional protective smart fabrics.