- Breathable and Elastic Material: Crafted from breathable and elastic fabric, this cooling liner ensures comfort without compromising on ventilation. It easily fits various helmets and hats, making it a versatile choice for different headgear. - Advanced Cooling Technology: Utilizing PCM (Phase Change Material) technology, the Hard Hat Ice Pack Liner delivers a long-lasting cooling sensation. This feature enhances comfort during extended wear, making it ideal for outdoor work or activities on hot days. - Extended Cooling Duration: Experience continuous cooling relief for over two hours. This reliable performance provides essential support during demanding tasks, keeping your head temperature comfortable in warm conditions. - Versatile Applications: Perfect for outdoor enthusiasts engaged in cycling, camping, or fishing, this cooling pad adapts to various activities. Its flexible design meets user needs, ensuring a refreshing experience during long outings. - Easy Insertion: The thoughtful design allows for straightforward insertion of the cooling pack while maintaining breathability, ensuring hassle-free use across different helmets. - Comfort on Demand: This cooling liner is an essential addition for anyone requiring effective temperature regulation while enjoying outdoor adventures, ensuring both safety and comfort throughout your activities.