Wearable Tailored Passive Radiative Cooling Textile for Flexible Electronic Integration

ABSTRACT Textiles are ideal platforms for wearable electronics due to their inherent softness and superior thermophysiological comfort. However, conventional textiles prioritize wearer comfort at the cost of the stringent thermal‐optical demands imposed by embedded electronics, often sacrificing scalability, breathability, electronic integrability, device performance, and user safety. Here, we report a wearable tailored passive radiative cooling textile (WRCT) for seamless integration of flexible electronics. The WRCT was fabricated via a scalable, one‐step, and additive‐free wet‐spinning technique. Hierarchical phase inversion kinetics create microfibers with multiscale porosity and surface nodules, achieving solar reflectance (>95%) and mid‐infrared emissivity (0.96). This single‐material platform satisfies the conflicting requirements of wearing comfort and electronic functionality by providing breathability, flexibility, and passive daytime thermal management. These properties thermally decouple electronics from the skin and keep skin temperature below 41°C even under intense sunlight (500 W/m 2 ) combined with a localized heat load equivalent to a heat flux of approximately 17 kW/m 2 over a 142 mm 2 area, simulating high‐power microcontrollers, conditions that cause low‐temperature burns within minutes on conventional textiles. By converting a commodity polymer into an advanced thermal‐optical regulator through a mature and scalable fiber‐production process, this textile establishes a practical, safe, and manufacturable foundation for reliable, all‐day wearable electronic systems.