Use a soft tape measure to find the circumference of your head. Wrap it around where the hat will rest, typically just above your eyebrows and about one eighth of an inch above your ears.

Keep the tape snug but comfortable. It should not feel tight or loose, just how you would want your hat to fit.

No tape measure? You can use a piece of string. Wrap it around your head the same way, then lay it flat and measure the length against a ruler.

If you’re basing your size on another hat, check that brand’s sizing chart. Sizes can vary slightly between makers, with some running a bit larger or smaller.

Keep in mind: Hats naturally mold to the shape of your head over time, becoming even more comfortable with wear, just like a favorite pair of boots.