Size
Head Circumference
X-Small
20 1/2 - 21 1/8"
(54 cm)
Small
21 1/4 - 22 1/8"
(56 cm)
Medium
22 3/8 - 23 1/8"
(58 cm)
Large
23 1/4 - 23 3/4"
(60 cm)
X-Large
23 7/8 - 24 3/4"
(62 cm)
2X-Large
24 7/8 - 25 3/4"
(64 cm)