Material: Glycerin, Sodium Polyacrylate Size: 8*9*5cm / 3.12"*3.51"*1.95" Color: As shown in the picture 1. Adopts efficient cooling gel technology, long-lasting cooling, providing all-weather cooling experience for your sun hat. 2. Can be and used repeatedly, safe and solid, perfect for various styles of hats, especially suitable for outdoor sports and hot weather. 3. Soft and lightweight design, does not add extra burden to the hat, comfortable to wear, and the cooling effect is immediate. 4. Leak-proof sealing structure ensures safety, and there will be no leakage even if used for a long time. 5. A variety of sizes are available, which can easily fit different hat types. It is a must-have for summer travel, travel or work. Package includes: 1 package contains 1/2 products