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Hi Jim.
Thank you for your question. Please see below for the O'Neill wetsuit hood size guide:
Size Neck (cm) Head (cm)
XS 36 - 38 48 - 53
S 37 - 39 51 - 56
M 38 - 41 53 - 58
L 39 - 42 56 - 61
XL 41 - 43 58 - 64
XXL 42 - 44 61 - 66
Many Thanks, AC Customer Service Team