These summer hats are a great addition to your beach or summer wardrobe. To use them, simply place the hat on your head. They are perfect for protecting you from the sun during summer days. When it comes to maintenance, you can gently wipe the hat with a soft cloth to keep it clean. As for the warning, since it may expose you to certain chemicals, avoid chewing or ingesting the hat, and always wash your hands after handling it. Also, keep it away from children who might put it in their mouths.