[Efficient Cooling Performance] The Ice Hat Liner is designed to provide excellent cooling performance, making it ideal for hot summer days. The ice cap mat helps regulate body temperature, ensuring you stay cool and comfortable during outdoor activities such as mountaineering, sports, fishing and shopping. [Versatile and multifunctional] This cooling ice mat cover can be used in different types of headwear, including hats, caps and helmets. Its versatile design makes it suitable for a wide range of activities, providing heat relief whatever your outdoor activity. [Comfortable and lightweight] Made with lightweight, breathable materials, the mat's covering ice is comfortable to wear for long periods of time. Easily fits over hat without adding bulk, ensuring you stay cool without compromising comfort. [Reusable & ] The ice cap mat is reusable and designed for long term use. Simply freeze it before use and it will provide hours of refreshing relief. Its construction ensures it stands up to repeated use, making it a refreshing solution for summer. [Easy to use and maintain] Using the ice hat liner is simple: just freeze the mat, put it in the hat and enjoy instant cooling. It's also easy to clean and maintain, only requiring a quick rinse or cleaning after use to keep it fresh and ready for your next adventure.