Features:Introducing the cooling pad PCMs natural temperature control material, a revolutionary product designed with a special material used to protecting astronauts. Crafted with heat-resistant TPU, this innovative pad ensures durability and long-lasting cooling effects. Simply insert the pad into your hat, refrigerate for 10 minutes, and experience enhanced comfort and coolness.REUSABLE: If the state of the cooling pad becomes liquefied, put it into the refrigerator for 15 minutes, the neckband will solidify soon, which means you can use it again.EASY TO CARRY: The cooling pad is small in size and fits easily into your bag, making it easy to carry and use when you are out and about.Ideal for various headwear such as cycling helmets, baseball cap, and fisherman hats, this universal pad offers a natural crystallization process at 28 Degrees for continuous cooling. Perfect for hot summer days, it provides a refreshing-sensations during outdoor activities, elevating your cooling experience.After use, simply wash the pad for repeated use. Its soft texture ensures a gentle feel on the skin, making it a must-have accessory for all your outdoor-adventure.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementDescription:Size: 205*205*6mm