1Choose lightweight fabrics, external sunscreen fabrics, sunshade, fast drying, breathable. 2Sweat absorption belt: hide inside the design of sweat absorption belt, help you sweat absorption, skin comfort. 3Adjustable hat belt: suitable for different face shapes and comfortable wearing. 4Cap circumference adjustment buckle: can adjust according to the size of the head circumference. 5Suitable environment: camping, hiking, fishing, cycling.