Measure the circumference of your head at the widest part (typically about 1–2 cm above the eyebrows)
Use a flexible tape measure and keep it level around your head
Record the measurement in centimeters or inches
If you’re between sizes, choose the larger size for a more comfortable fit
Measure again if you’re unsure, and use the larger of the two measurements
For hats with sizing adjustments (strap or band), measure your head circumference and match to the closest size
If you’re measuring an existing hat, measure the inside circumference at the band (or the hat’s inner edge) and compare to the size chart