There is a adjutable belt behind the back of the hat.It can adjust the size

Suggested use of the crowd:Head circumference 56-60CM

minimum value ofHead circumference:53CM

Maximum value of Head circumference:61cm

Brim:about 7.5cm

thelength offabric :about 16CM

The depth of the hat:about 11cm

NOTE:Size may have slight difference because of measure by hand