This study presents the development of transparent radiative cooling metamaterials for use as cover windows in foldable and flexible electronic displays. The metamaterials, composed of clear polyimide (c-PI) and PMMA-infiltrated silica (SiO₂) aerogel microparticles, are designed to enhance thermal management while maintaining optical transparency. Key features include: 1. **Optical Properties**: The metamaterials exhibit high visible transmission (85.5%) and light emission in the atmospheric window (94.6%), enhancing display performance. 2. **Mechanical Properties**: They have a higher elastic modulus (2.51 GPa) and tensile strength (79.8 MPa) compared to c-PI, providing better protection against mechanical damage. 3. **Moisture-Impermeable Properties**: The water vapor transmission rate is significantly reduced (0.6 times lower than c-PI), ensuring moisture protection. 4. **Radiative Cooling Performance**: The metamaterials effectively suppress temperature rise in both indoor and outdoor conditions, demonstrating up to 8.3 °C reduction in temperature under solar illumination. The study also evaluates the impact of these metamaterials on light-emitting diodes (LEDs) and flexible displays, showing improved light output and thermal management. Overall, the transparent radiative cooling metamaterials offer a promising solution for efficient thermal management in flexible electronic devices.This study presents the development of transparent radiative cooling metamaterials for use as cover windows in foldable and flexible electronic displays. The metamaterials, composed of clear polyimide (c-PI) and PMMA-infiltrated silica (SiO₂) aerogel microparticles, are designed to enhance thermal management while maintaining optical transparency. Key features include: 1. **Optical Properties**: The metamaterials exhibit high visible transmission (85.5%) and light emission in the atmospheric window (94.6%), enhancing display performance. 2. **Mechanical Properties**: They have a higher elastic modulus (2.51 GPa) and tensile strength (79.8 MPa) compared to c-PI, providing better protection against mechanical damage. 3. **Moisture-Impermeable Properties**: The water vapor transmission rate is significantly reduced (0.6 times lower than c-PI), ensuring moisture protection. 4. **Radiative Cooling Performance**: The metamaterials effectively suppress temperature rise in both indoor and outdoor conditions, demonstrating up to 8.3 °C reduction in temperature under solar illumination. The study also evaluates the impact of these metamaterials on light-emitting diodes (LEDs) and flexible displays, showing improved light output and thermal management. Overall, the transparent radiative cooling metamaterials offer a promising solution for efficient thermal management in flexible electronic devices.