Everyone likes the sun even though it may not be good for you. This hat protects: your head, your eyes, your face and the back of your neck. The sheild can be adjusted to allow hot air to pass out vents on the side of the hat. I'm not sure what material is used in this hat but it is very light weight. The sheild can be wetted to add to the cooling. Protect yourself in and from the hot summer sun; buy one.