100% Cotton 100% cotton. Size: ajustable.Circumference: 21.6-23.2inches / 55-59cm.Brim: 2.76inches / 7cm.Crown: 3.54inches / 9cm. This cap is also washable and quickly dry. It is so durable that will not lose it shape. Best quality in market,Unisex. This kind of baseball hat has a good absorbent function, and its mesh design can increase the permeability of the hat.