MEASURING YOUR HEAD SIZE Heads come in all sizes, and in a surprising variety of shapes. Although Akubra hats are adaptable, and will usually conform to differences in shape with a little wearing, it is essential that the size be correct for your head. TO DETERMINE YOUR HAT SIZE FOLLOW THESE 3 SIMPLE STEPS: Measure the circumference around your head - approximately 12mm (1/2") above the ears Keep the dressmaker tape level and firm, across the temple and above the eyebrow ridges. Check the size chart given below. NOTE: For in-between measurements use the next size up.