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Patagonia Adult Hat Size Chart

 Small / MediumLarge / X-LargeOne Size
Adult Head Circumference (inches)21.75 - 22.7522.75 - 2421.75 - 24
Women's (inches)  21.25 - 23.25

Patagonia Kids' Hat Size Chart

Hat SizeAgeHead Circumference
Small4 - 6 yrs20 - 21 in.
Medium6-10 yrs21-22 in.
Large10+ yrs22 - 23 in.