To use these fuzzy fedora hats, simply place them on your head. They are one - size - fits - all, so they should be easy to wear. When it comes to maintenance, you can gently hand - wash them in cold water with a mild detergent. Avoid using harsh chemicals as they might damage the 100% polyester material. After washing, let them air dry. Also, keep in mind the California Proposition 65 Warning. This product contains chemicals like cadmium, lead, and nickel that can be harmful. Do not ingest or allow these hats to come into contact with open wounds.