These black frayed edge straw hats are a great addition to your wardrobe. They're one - size - fits - all, so anyone can wear them. To use, simply place the hat on your head. When you're out in the sun, they'll give you some protection. Be aware that they contain chemicals like cadmium, lead, and nickel, as mentioned in the California Proposition 65 warning. For maintenance, keep them in a dry place. If they get a bit dirty, you can gently brush off the dust. Avoid getting them wet as the paper material may be damaged.