Stetson Lamb Nappa Convertible Aviator Hat UNISEXThe Stetson pilot's cap is made of smooth leather. Its rustic quality is reflected in the grain like surface texture. The leather cap has a stylish printed cotton lining for a snug, comfortable fit. An adjustable buckle at the back of the head optimizes the fit. It also has side extensions that can be tucked under the chin. Fits true to size Size M = 56cm to 57cm Size L = 58cm to 59cm Size XL= 60cm to 61cm All Lamb Leather Lining 100% cotton Lenght