The fabric of this hat is twill cotton, with good moisture absorption and balance, soft and smooth, moisture can keep balance. It has high elasticity, can store a lot of air, good insulation performance. There is no stimulation, no side effect when the fabric touches human skin. It is safe and hygienic. It has good stain resistance and can be washed and dried by machine. It is very durable. The curved brim of the hat makes it more snug to the head, less likely to be blown away by the wind and better able to block direct sunlight. It has an adjustable bag strap on the back for everyone to wear.