To use this hat, simply adjust the headband with a single pull to fit your head comfortably. It's great for summer trail runs, providing protection and comfort. When it comes to maintenance, hand wash it in cold water with mild detergent. Avoid using bleach or harsh chemicals. Let it air dry flat. Remember to keep it away from sharp objects to prevent damage. This hat can be worn under a helmet or hood, so you can use it in different situations.