SIZING GUIDE:
S: 52-54 cm, M: 54-56 cm, L: 57-61 cm, XL: 61.5-63.5 cm
S: 20 ½” – 21 ½” / M: 21 ½” – 22 ¼” / L: 22 ¼” – 24 ¼” / XL: 24 ½” – 25”
To verify your size, measure your head using a measuring tape or thread and ruler from the middle of your forehead and about 1 cm above your ears. If you are in the limit of a size, always choose one size up for a more comfortable fit.