【Not adjustable】 Because of the addition of sunglasses on the back, there is no button on the back of our hat, we can not adjust the size, suitable for the head circumference of 20.8 inches to 22.8 inches.【Unique design】: This cap has a unique design. There is a sunglasses that can be flipped at the back, so that the cap can be worn normally as usual. You can also wear the hat in reverse, which makes it more handsome and can also be used as a mask or sunglasses, providing convenience for your travel.【Many colors】：This aviator sunglasses cap has a variety of colors, you can choose, you can match any style of dress and a variety of outdoor sports, there is always one can meet your needs.【Comfortable material】：The hat is made of cotton fabric blend, with good moisture absorption and breathability, bringing a comfortable and refreshing wearing experience. Classic curved brim looks face delicate and small, sunglasses decoration for you to increase a lot of temperament.【Use】: Due to the unique design of the hat, it can perform well on many occasions, such as skiing, riding, baseball, hiking, traveling, friends gathering, shopping, picnics, sunbathing, etc. It will surely bring unexpected surprises.