measure these area of head!
1. The measuring tape works the best. If you don’t have a tape measure, then use a piece of non-stretch string to measure around your head and then check the length using a ruler or other measure.
2. Measure between 1~ 2 cm (3/8 ~ 6/8 inch) above your ears, where the hat sits on your head.
3. Measure from the most prominent part of the forehead (often 1-2 fingers above the eyebrow) around to the widest part of the back of the head.