To use these caps, simply place them on your head for a stylish look. When wearing, make sure it fits comfortably. As for maintenance, you can gently hand - wash them with mild detergent and cold water. Avoid using bleach as it may damage the cap's color and material. Also, keep in mind the California Proposition 65 warning. If you have any concerns about the chemicals in the product, refer to the provided website for more details.