Quickly catches sweat from your forehead. Just stick it on the inside of your helmet or cloth hat and it will sweat away more fun. Built-in polymer to cure sweat into a jelly shape inside It will not run out of sweat. Even if your glasses become cloudy due to sweat, you can even use this product for peace of mind. Depending on the amount of sweat, you can use it for several days. Made with non-woven fabric that is gentle on the skin, so there is no unpleasant stickiness. Can be used for helmets, hats, visors, bandanas, straw hats, collars, etc. Soak it in cold water and stick it to a helmet, and it can also be used to cool down in the heat. Package Size: Length: 10.6 inches (270 mm), Width: 2.0 inches (50 mm), Height: 0.4 inches (10 mm); Package Weight: 0.6 oz (18 g); Material: Non-binder non-woven fabric (built-in polymer polymer absorption); Quantity: 4 pieces; Uses: For work cap at construction sites, factories, etc. Also great for sports, leisure, and outdoor activities.