Weather-resistant coir geotextile is an innovative solution for preventing soil erosion while maintaining soil fertility. This environmentally friendly material leverages the natural durability of coir fibers, enhancing their resistance to weather conditions. It can be effectively used in various civil engineering applications, including road construction and the protection of sea and river shores. The treatment process to achieve weather resistance adds only 10% to the total cost of the geotextile, making it an economical choice for large-scale soil erosion prevention projects. This material provides a sustainable and efficient method to preserve the integrity of natural and man-made landscapes.