To find your size, simply measure the circumference around your head, slightly above your ears and your eyebrows, right about where the hat will sit.

X-Small
53-54 cm
Small
55-56 cm
Medium
57-58 cm
Large
59-60 cm
X-Large
61-62 cm
XX-Large
63-64 cm

No measuring tape? No problem! Just cut a piece of string. Use it to measure your head. Then measure the string using a common ruler.