Synergistic Radiative‐Evaporative Cooling and High‐Fidelity Sweat Sensing via Liquid Metal‐Integrated Janus Textiles

ABSTRACT Passive radiative cooling (PRC) textiles offer a sustainable route for personal thermoregulation, yet their performance is often compromised under high humidity or intense perspiration. Here, we present a synergistic radiative‐evaporative cooling and sweat‐sensing textile (RECS textile) that unifies efficient thermal regulation and high‐fidelity sweat monitoring for personal hygrothermal regulation. The textile consists of two asymmetrically functionalized bilayers, the SiO ₂ ‐ and K ₂ Ti ₆ O ₁₃ ‐modified Janus nonwovens printed with flexible liquid‐metal electrodes, collectively forming a Janus structure with asymmetric porosity and wettability. This design enables unidirectional sweat transport across the textile thickness, simultaneously sustaining evaporative cooling, enhancing radiative spectral selectivity through cooperative Mie scattering, solar reflection, and mid‐infrared emission, and continuously delivering sweat to the sensing electrode without accumulation or dilution. Consequently, the synergistic radiative‐evaporative mechanism contributes a cooling effect of 19.9°C (12.0°C contributed by evaporative cooling) under hygrothermal environments, and enables real‐time sweat volume monitoring with a sensitivity of ‐14.6 Ω µL ⁻¹ over a detection range of 20–120 µL, maintaining reliable performance during prolonged perspiration. This work provides a promising paradigm for next‐generation intelligent textiles that integrate adaptive thermal management and physiological sensing.