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Adult	Hat Size	Inches	CM
XS	6-5/8 - 6-3/4	20-87 - 21.26 in.	53-54cm
S	6-7/8 - 7	21.27 - 22.05 in.	55-56 cm
M	7-1/8 - 7-1/4	22.06 - 22.83 in.	57-58 cm
L	7-3/8 - 7-3/4	22.84 - 23.62 in.	59-60 cm
XL	7-5/8 - 7-7/8	23.63 - 24.41 in.	61-62 cm