This cooler box is made of EPS material, enclosed within a durable outer shell made of hard plastic that acts as a heat barrier. The advanced insulation technology is designed to effectively maintain the temperature, ensuring your food remains cold and fresh for extended periods. To use, just fill the ice packs with water once and freeze them overnight before each use. These versatile packs are ideal for preserving the freshness of fish, various foods, and fruits. Additionally, the logo can be customized to suit your branding needs.