How to find head size?
First, get yourself a tape-measure made from a flexible material like cloth, fabric, or bendable plastic.
Wrap the tape around your head, making sure you measure above your ears at the area where you prefer to wear your hat.
Although it is a matter of personal choice, a good spot to measure is the widest part of your head, as that’s where a hat often fits the best.
When You get:
54 cm = S size
55/56 cm = M size
57/58 cm = L size
59/60 cm = XL size
Measure several times to ensure you’re getting an accurate measurement.
Don’t pull the tape too tight; you always want to err on the side of having a little too much room.
If you fall between two sizes, we strongly recommend that you choose the larger in the interest of comfort.