These Los Angeles California bucket hats are really easy to use. Just place the hat on your head and adjust it to fit comfortably. They're great for a sunny day at the beach or a casual walk around town. As for the Proposition 65 warning, it's important to be aware that the product may have some chemicals. Don't chew or swallow the hat, of course. To keep your hats in good shape, gently hand - wash them in cold water with mild soap. Then, let them air - dry. Avoid using harsh chemicals or machine - drying as this may damage the hats.