Determining your hat size, head circumference.

Method and tips to properly measure your head circumference. So? Strong-headed or small-headed?

3 Ways to Measure Head Circumference - wikiHow

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Hat Size Calculator

A Guide to Hat Sizing — Woolly Wormhead

Fit guide

How to measure head size for hat – Herbert Johnson

Size Guide — LIDROW

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Hat Size Charts, Measurements & More

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