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Arc'teryx Hats' Size Chart

Head sizing is based on the circumference around the head. 
 
SizeS - ML - XLOne Size Fits All
Head Circumference (in) 213/4 - 221/2223/4 - 231/2213/4 - 231/2
Head Circumference (cm)55 - 5758 - 6055 - 60