Measures 5 inches tall and 16 inches wide. The inner circumference is 58 cm, which equates to 23 inches, US hat size 7-1/4, or generic size large. However, this hat has an adjustable tie that can be used to make it smaller. Please determine whether it will fit your head before purchasing. Using a flexible measuring tape (or a piece of string and a ruler), wrap it around your head slightly above your ears and a half inch above your eyebrows. Remember to consider whether the hat will be worn over a wig or scarf/bandana.