O'Neill Sizing chart:

XS (5'7-5'9, 125-140 lbs.)

S (5’8-5’10, 135-155 lbs.)

M (5’9-5’11, 150-170 lbs.)

L (5’10-6’0, 170-190 lbs.)

XL (5’11-6’1, 190-210 lbs.)