Beautop Men&lsquo;s Summer Quick Dry Cycling Fishing Hat UV Protection Sun Hat Material: Quick dry polyester, waterproof Size M: Hat circumference about 58cm, adjustable, suitable for head circumference 54-58cm Size L: Hat circumference about 60cm, adjustable, suitable for head circumference 59-61cm Brim length about 12cm, back flap length about 25cm. You can roll it in small size, portable Good for mountaineering, Jungle, cycling, fishing and other outdoor activities