To get an accurate measurement, you will need a soft, flexible measuring tape. If you do not have one, you can use a piece of non-stretching string or ribbon and then measure that against a ruler later.
Write down the measurement in both centimeters and inches, as different brands use different units. Step 2: Use a Hat Size Chart how to know what size hat to buy
Most manufacturers categorize hats into "Generic" (S, M, L) or "Numerical" (US/UK) sizes based on the circumference you just measured. Measure Your Hat Size, Head Circumference To get an accurate measurement, you will need
Place the measuring tape around your head, approximately 1/8 to 1/2 inch (0.3–1 cm) above your ears and across the middle of your forehead —exactly where the hat's sweatband will sit. To get an accurate measurement