Park chairs are exposed to harsh weather conditions, yet they often remain warp-free due to careful design and material selection. Manufacturers typically use weather-resistant materials like treated wood, aluminum, or high-density polyethylene (HDPE) to minimize moisture absorption, a primary cause of warping. Additionally, proper construction techniques, such as slatted designs that allow airflow and reduce water pooling, help maintain structural integrity. Regular maintenance, including cleaning and applying protective coatings, further extends their lifespan. By combining durable materials and smart engineering, park chairs resist warping and stay functional for years.