Buckle closure.HAT SIZE : One size fits most head baseball cap , Brim Length: 2.95( 7cm ) Brim Width:6 ( 16cm ) Top to Edge Legth: 6 (17cm) Inner Circumference : 22 -23 ( 56cm-60cm) ,by using the adjustable strap with buckle closure can adjust the size of the blank hat flexibly to fit your head.PRODUCT FEATURES : 100% cotton cloth, lightweight ball cap, metal buckle closure, adjustable trapback, 6 panels, Structured front can keep the hat in shape, 6 eyelets make the head breathable, Soft seatband make the head more comfortable and soak away sweat quickly, Low profile brim can protect your face from the sun uv ray.GREAT AS A GIFT : These blank baseball hats with no writing on it that can be accepted by almost everyone,so its an excellent present idea for your family,friends,lovers.We have different color combinations for you to choose from. Its a great gift for Daily gifts / Birthday present / Fahthers Day / Mothers Day / Valentines Day / Christmas present / Thanksgiving Day.MULTIPLE USE: Great for sports activities,outdoor adventures,group activities,workout routine. Its a good quality sport hat for baseball / golf / performance / hiking / running / jogging / cycling / camping / seashore leisure /.