【Adopt Advanced Cooling Material PCM! Comfortable Cool Down at 28°C】 Uses advanced PCM material originally researched for use in space development. It maintains a comfortable 28°C, which is easy to feel pleasant, without being too cold like ice, and gently cools the head. This innovative item freezes naturally just by placing it in an air-conditioned room or in cold water (below 28°C). 【Liberate Yourself from Hat Stuffiness and Heat! Directly Cool Your Head】 When wearing a hat for protection against strong summer sun, the inside tends to get stuffy and uncomfortable. Simply attach this cool pad inside your hat or helmet to directly cool your head, where heat tends to build up, significantly reducing discomfort from sweat. Wearing hats in the summer becomes surprisingly comfortable. 【No Condensation, Reusable! Economical and Eco-Friendly】 Unlike ice or cold packs, a major feature of PCM material is that its surface does not condense. There's no need to worry about wetting your precious hats or hair. Furthermore, it can be frozen and melted repeatedly, making it very economical. It's a sustainable heat-relief product that is environmentally friendly as it is not disposable. 【Compatible with Various Hats and Helmets! Easy to Attach】 Designed to fit various types of hats, including baseball caps, straw hats, and work helmets. Anyone can easily attach and detach it using the included hook-and-loop fastener (Velcro). It's lightweight, so you'll barely feel any weight or discomfort when wearing it. 【Great for All Summer Occasions! Recommended for Heatstroke Prevention】 Perfect for outdoor activities like golf, fishing, and camping under the blazing sun, as well as outdoor work such as construction sites and farm work, daily commutes, and watching sports. It's a reliable ally for heatstroke prevention that is useful in all situations. Also recommended as a gift for your cherished family and friends. 2081