The adjustable size design can be adjusted to fit the size of your head, so that you can avoid the embarrassment of blowing off your hat due to high winds. Open design is also suitable for various hairstyles, such as ponytails. Our hats are suitable for adults with various head sizes. The wide brim is like taking a cool shade in the shade of a tree. The design that fits your face can perfectly block ultraviolet rays, and can provide the best sun protection for your face, eyes and neck. The open top provides good ventilation and cooling effect, and enjoys the light and durable comfort in the hat. At the same time, it prevents sweat from entering the eyes. It is an excellent choice for sports, walking, running, golf and tennis, backpacking and even fishing.