Amazon.com: Foldable Big Straw Hats for Women Dome Black 。Premium Material: The sun hats for women are made of 80% paper and 20% polyester, lightweight, breathable and comfortable. The inside of sun hat has a sweat-absorbing belt to help wick moisture away, providing you utmost comfort. And tight braiding ensures the durability UV Protection: Our beach hat with a 4\" brim can effectively cover your face and neck, protecting you from sun and harmful rays and providing excellent sun protection. Just enjoy your beach trip with the summer straw hat Comfortable fit: Head meaturement 22.5 - 23.5\" , the straw sun hat is suitable for most women. The head size can be adjusted by inside strap under the sweatband to ensure a cozier fit (tighten 2-3cm). Besides, we offer an adjustable chin strap that is easy to attach and detach, helping hold the beach hat in place, even on windy days