1. Comfort and Breathability: Designed with elastic and breathable material, this helmet liner ensures comfort during use and fits with various types of hats and helmets. The versatile design allows for broad application without compromising airflow. You can wear it all day during outdoor activities or work to maintain freshness and comfort. 2. Cooling Experience: Featuring innovative PCM technology, this liner provides extended cooling effects, keeping your head cool during prolonged use in various environments while ensuring comfort without sacrificing safety or functionality. It's for those who work long hours under challenging conditions. 3. Reliable Temperature Control: Thanks to its extended cooling properties, this innovative hard hat liner delivers effective cooling performance, offering a refreshing sensation for up to two hours to enhance user experience in warm environments. Specifically designed for those exposed to temperatures, it's an ideal solution for indoor and outdoor tasks where heat can be exhausting. 4. Easy to Use: It enhances the experience for people engaged in activities like cycling, camping, fishing, and other outdoor leisure pursuits. Its intuitive design ensures effortless and comfortable application at all times without compromising functionality.